US3934743A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Blow molded, oriented plastic bottle and method for making same
Assignee: Rexam Beverage Can Co
•
Filing: 1972-12-29
•
Granted: 1976-01-27
•
Expires: 1992-12-29
Abstract
Abstract A molecularly oriented article having a tubular sidewall is blow-molded from a thermoplastic parison which is heat-treated prior to blowing to provide the parison sidewall with a temperature gradient wherein the temperature of the inside of the sidewall is greater than that of the outside, both of said temperature being within the orientation temperature range of the thermoplastic. The temperature gradient results in the sidewall of the article having a different and more uniform circumferential orientation release stress distribution radially across the sidewall than would be obtained if the parison were blown isothermally.
Inventors
- 👤 Charles Edmund McChesney
- 👤 Robert J. McHenry
- 👤 James Alan Wachtel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:30
CPC Classifications
B; B29; B29C; B29C49/00; B29C49/42; B29C49/64; B29C49/6409; B29C49/6436; B29C49/6445; B29C49/0005; B29C49/48; B29C49/4823; B29C49/6454; B65; B65D; B65D1/00; B65D1/02; B65D1/0223; B29C2949/00; B29C2949/07; B29C2949/0715; B29C2949/081; B29C2949/0811; B29C2949/082; B29C2949/0829; B29C2949/20; B29C2949/22; B29C2949/24; B29C2949/26; B29C2949/28; B29C2949/30; B29C2949/3024; B29C2949/3032; B29C49/02; B29C49/06; B29C49/42394; Y; Y10; Y10S; Y10S428/00; Y10S428/91; Y10T; Y10T428/00; Y10T428/13; Y10T428/1352; Y10T428/1386; Y10T428/1397; Y10T428/24; Y10T428/24479; Y10T428/24942; Y10T428/31
Claims Analysis
Total Claims: 36
Claim 1
Independent Claim
170 words
A self-supporting biaxially oriented plastic container blow molded from a parison across the thickness of its sidewall an outwardly radially decreasing temperature gradient within the orientation temperature range of and made from a glassy, essentially non-crystalline thermoplastic polymeric material which is capable of being biaxially oriented during blow molding, said container having a tubular sidewall with inner and outer surfaces, said sidewall having inner, middle and outer portions and being characterized in that in an axial zone thereof the percentage variation of the circumferential orientation release stress from said inner portion to said outer portion is less than about 4% per mil of sidewall thickness, said percentage variation being determined by multiplying 100 by a fraction in which the numerator is the difference between the orientation release stresses at said inner and outer portions and in which the denominator is the average of the orientation release stresses in said inner, middle and outer portions multiplied by the radial distance in mils between the centerlines of the inner and outer portions.
Claim 2
Dependent Claim
170 words
A self-supporting biaxially oriented plastic container blow molded from a parison across the thickness of its sidewall an outwardly radially decreasing temperature gradient within the orientation temperature range of and made from a glassy, essentially non-crystalline thermoplastic polymeric material which is capable of being biaxially oriented during blow molding, said container having a tubular sidewall with inner and outer surfaces, said sidewall having inner, middle and outer portions and being characterized in that in an axial zone thereof the percentage variation of the circumferential orientation release stress from said inner portion to said outer portion is less than about 4% per mil of sidewall thickness, said percentage variation being determined by multiplying 100 by a fraction in which the numerator is the difference between the orientation release stresses at said inner and outer portions and in which the denominator is the average of the orientation release stresses in said inner, middle and outer portions multiplied by the radial distance in mils between the centerlines of the inner and outer portions.
Claim 3
Dependent Claim
72 words
A container according to claim 1 wherein the tubular sidewall has a circumferentially directed orientation, said sidewall being characterized in that the maximum circumferential orientation release stress in an axial zone of said sidewall along each line defined by the intersection of a plane normal to the axis of said tubular sidewall and a plane including said axis, is less than about twice the minimum circumferential orientation release stress along said line.
Claim 4
Dependent Claim
81 words
A container according to claim 1 wherein the tubular sidewall has a circumferentially directed orientation, said sidewall being characterized in that in an axial zone thereof the maximum circumferential orientation, as measured by the orientation release stress, in said sidewall along each line defined by the intersection of a plane normal to the axis of said sidewall and a plane including said axis is less than about twice the minimum orientation along said line, as measured by the orientation release stress.
Claim 5
Dependent Claim
71 words
A container according to claim 1 wherein the tubular sidewall is characterized in that, in an axial zone of said sidewall and along each line defined by the intersection of a plane normal to the axis of said sidewall and a plane including said axis, the orientation release stress in the inner portion is from about 75 percent to about 125 percent of the orientation release stress in said middle portion.
Claim 6
Dependent Claim
82 words
A container according to claim 1 wherein the tubular sidewall is characterized in that, in an axial zone in said sidewall and along each line defined by the intersection of a plane normal to the axis of said tubular sidewall and a plane including said axis, the orientation, as measured by the orientation release stress, in the inner portion is from about 75 percent to about 125 percent of the orientation, as measured by the orientation release stress, in said middle portion.
Claim 7
Dependent Claim
22 words
The blow molded oriented plastic container claimed in claim 1 wherein said percentage variation is less than about 3 percent per mil.
Claim 8
Dependent Claim
16 words
The blow molded oriented plastic container claimed in claim 6 wherein said container is a bottle.
Claim 9
Dependent Claim
85 words
The blow molded oriented plastic container claimed in claim 1 wherein said container is a bottle, said percentage variation is less than about 3 percent per mil, and wherein said polymeric material is prepared by polymerizing a major portion of an olefinically unsaturated nitrile and a minor portion of an ester of a polymerizable olefinically unsaturated carboxylic acid in the presence of a preformed rubbery copolymer composed of a major proportion of a conjugated diene monomer and a minor proportion of an olefinically unsaturated nitrile.
Claim 10
Dependent Claim
181 words
The blow molded oriented plastic container claimed in claim 1 wherein said container is a bottle, said percentage variation is less than about 3 percent per mil, and wherein said polymeric material is derived from (A) about 60 to 90 parts by weight of an alpha, beta-olefinically unsaturated mononitrile having the structure CH 2 =C(-R.sub. 1)-CN where -R 1 is selected from the group consisting of hydrogen, halogen, and lower alkyl groups, (B) about 40 to 10 parts by weight of an ester of an olefinically unsaturated carboxylic acid having the structure CH 2 =C(-R.sub. 1)-C(O)O-R.sub. 2 where -R 1 is as defined above and -R 2 is an alkyl group having from 1 to 6 carbon atoms, (A) and (B) together comprising 100 parts by weight, polymerized in the presence of (C) about 1 to 20 parts by weight of a nitrile rubber containing about 60 to 80 percent by weight of moieties derived from a conjugated diene monomer and about 40 to 20 percent by weight of moieties derived from a mononitrile having said CH 2=C (-R.sub. 1)-CN structure.
Claim 11
Dependent Claim
83 words
The blow molded oriented plastic container claimed in claim 1 wherein said container is a bottle, said percentage variation is less than about 3 percent per mil, and wherein said polymeric material is derived from 73 to 77 parts by weight acrylonitrile and 27 to 23 parts by weight methyl acrylate, polymerized in the presence of 8 to 10 additional parts by weight of a nitrile rubber containing about 70 percent by weight butadiene moieties and about 30 percent by weight acrylonitrile moieties.
Claim 12
Dependent Claim
16 words
The blow molded oriented plastic container claimed in claim 2 wherein said container is a bottle.
Claim 13
Dependent Claim
67 words
The blow molded oriented plastic container claimed in claim 11 wherein said polymeric material is prepared by polymerizing a major portion of an olefinically unsaturated nitrile and a minor portion of an ester of a polymerisable olefinically unsaturated carboxylic acid in the presence of a preformed rubbery copolymer composed of a major proportion of a conjugated diene monomer and a minor proportion of an olefinically unsaturated nitrile.
Claim 14
Dependent Claim
162 words
The blow molded oriented plastic container claimed in claim 11 wherein said polymeric material is derived from (A) about 60 to 90 parts by weight of an alpha,beta-olefinically unsaturated mononitrile having the structure CH 2 =C(-R.sub. 1)-CN where -R 1 is selected from the group consisting of hydrogen, halogen, and lower alkyl groups, (B) about 40 to 10 parts by weight of an ester of an olefinically unsaturated carboxylic acid having the structure CH 2 =C(-R.sub. 1)-C(O)O-R.sub. 2 where -R 1 is as defined above and -R 2 is an alkyl group having from 1 to 6 carbon atoms, (A) and (B) together comprising 100 parts by weight, polymerized in the presence of (C) about 1 to 20 parts by weight of a nitrile rubber containing about 60 to 80 percent by weight of moieties derived from a conjugated diene monomer and about 40 to 20 percent by weight of moieties derived from a mononitrile having said CH 2 =C(-R.sub. 1)-CN structure.
Claim 15
Dependent Claim
65 words
The blow molded oriented plastic container claimed in claim 11 wherein said polymeric material is derived from 73 to 77 parts by weight acrylonitrile and 27 to 23 parts by weight methyl acrylate, polymerized in the presence of 8 to 10 additional parts by weight of a nitrile rubber containing about 70 percent by weight butadiene moieties and about 30 percent by weight acrylonitrile moieties.
Claim 16
Dependent Claim
29 words
The blow molded oriented plastic container claimed in claim 14 wherein said maximum circumferential orientation release stress is less than about 1.5 times said minimum circumferential orientation release stress.
Claim 17
Dependent Claim
16 words
The blow molded oriented plastic container claimed in claim 4 wherein said container is a bottle.
Claim 18
Dependent Claim
67 words
The blow molded oriented plastic container claimed in claim 16 wherein said polymeric material is prepared by polymerizing a major portion of an olefinically unsaturated nitrile and a minor portion of an ester of a polymerizable olefinically unsaturated carboxylic acid in the presence of a preformed rubbery copolymer composed of a major proportion of a conjugated diene monomer and a minor proportion of an olefinically unsaturated nitrile.
Claim 19
Dependent Claim
162 words
The blow molded oriented plastic container claimed in claim 16 wherein said polymeric material is derived from (A) about 60 to 90 parts by weight of an alpha,beta-olefinically unsaturated mononitrile having the structure CH 2 =C(-R.sub. 1)-CN where -R 1 is selected from the group consisting of hydrogen, halogen, and lower alkyl groups, (B) about 40 to 10 parts by weight of an ester of an olefinically unsaturated carboxylic acid having the structure CH 2 =C(-R.sub. 1)-C(O)O-R.sub. 2 where -R 1 is as defined above and -R 2 is an alkyl group having from 1 to 6 carbon atoms, (A) and (B) together comprising 100 parts by weight, polymerized in the presence of (C) about 1 to 20 parts by weight of a nitrile rubber containing about 60 to 80 percent by weight of moieties derived from a conjugated diene monomer and about 40 to 20 percent by weight of moieties derived from a mononitrile having said CH 2 =C(-R.sub. 1)-CN structure.
Claim 20
Dependent Claim
65 words
The blow molded oriented plastic container claimed in claim 16 wherein said polymeric material is derived from 73 to 77 parts by weight acrylonitrile and 27 to 23 parts by weight methyl acrylate, polymerized in the presence of 8 to 10 additional parts by weight of a nitrile rubber containing about 70 percent by weight butadiene moieties and about 30 percent by weight acrylonitrile moieties.
Claim 21
Dependent Claim
37 words
The blow molded oriented plastic container claimed in claim 19 wherein said orientation release stress in said inner portion is from about 90 percent to about 110 percent of said orientation release stress in said middle portion.
Claim 22
Dependent Claim
37 words
The blow molded oriented plastic container claimed in claim 1 wherein said average of the orientation release stresses in said inner, middle and outer portions is in the range from about 800 p.s.i. to about 1,000 p.s.i.
Claim 23
Dependent Claim
37 words
The blow molded oriented plastic container claimed in claim 6 wherein said average of the orientation release stresses in said inner, middle and outer portions is in the range from about 800 p.s.i. to about 1,000 p.s.i.
Claim 24
Dependent Claim
37 words
The blow molded oriented plastic container claimed in claim 7 wherein said average of the orientation release stresses in said inner, middle and outer portions is in the range from about 800 p.s.i. to about 1,000 p.s.i.
Claim 25
Dependent Claim
37 words
The blow molded oriented plastic container claimed in claim 10 wherein said average of the orientation release stresses in said inner, middle and outer portions is in the range from about 800 p.s.i. to about 1,000 p.s.i.
Claim 26
Dependent Claim
47 words
The blow molded oriented plastic container claimed in claim 2 wherein said sidewall has inner, middle and outer portions and wherein said average of the orientation release stresses in said inner, middle and outer portions is in the range from about 800 p.s.i. to about 1,000 p.s.i.
Claim 27
Dependent Claim
47 words
The blow molded oriented plastic container calimed in claim 14 wherein said sidewall has inner, middle and outer portions and wherein said average of the orientation release stresses in said inner, middle and outer portions is in the range from about 800 p.s.i. to about 1,000 p.s.i.
Claim 28
Dependent Claim
47 words
The blow molded oriented plastic container claimed in claim 15 wherein said sidewall has inner, middle and outer portions and wherein said average of the orientation release stresses in said inner, middle and outer portions is in the range from about 800 p.s.i. to about 1,000 p.s.i.
Claim 29
Dependent Claim
37 words
The blow molded oriented plastic container claimed in claim 4 wherein said average of the orientation release stresses in said inner, middle and outer portions is in the range from about 800 p.s.i. to about 1,000 p.s.i.
Claim 30
Dependent Claim
37 words
The blow molded oriented plastic container claimed in calim 16 wherein said average of the orientation release stresses in said inner, middle and outer portions is in the range from about 800 p.s.i. to about 1,000 p.s.i.
Claim 31
Dependent Claim
37 words
The blow molded oriented plastic container claimed in claim 19 wherein said average of the orientation release stresses in said inner, middle and outer portions is in the range from about 800 p.s.i. to about 1,000 p.s.i.
Claim 32
Dependent Claim
69 words
The blow molded oriented plastic container claimed in claim 1 wherein said sidewall is further characterized in that the maximum circumferential orientation release stress in an axial zone of said sidewall along each line defined by the intersection of a plane normal to the axis of said tubular sidewall and a plane including said axis, is less than about twice the minimum circumferential orientation release stress along said line.
Claim 33
Dependent Claim
75 words
The blow molded oriented plastic container claimed in claim 31 wherein said sidewall is further characterized in that, in an axial zone of said sidewall and along each line defined by the intersection of a plane normal to the axis of said sidewall and a plane including said axis, the orientation release stress in the inner portion is from about 75 percent to about 125 percent of the orientation release stress in said middle portion.
Claim 34
Dependent Claim
76 words
The blow molded oriented plastic container claimed in claim 1 wherein said container is a bottle, and wherein said sidewall is further characterized in that the maximum circumferential orientation release stress in an axial zone of said sidewall along each line defined by the intersection of a plane normal to the axis of said tubular sidewall and a plane including said axis, is less than about twice the minimum circumferential orientation release stress along said line.
Claim 35
Dependent Claim
75 words
The blow molded oriented plastic container claimed in claim 33 wherein said sidewall is further characterized in that, in an axial zone of said sidewall and along each line defined by the intersection of a plane normal to the axis of said sidewall and a plane including said axis, the orientation release stress in the inner portion is from about 75 percent to about 125 percent of the orientation release stress in said middle portion.
Claim 36
Dependent Claim
16 words
The blow molded oriented plastic container claimed in claim 1 wherein said container is a bottle.
References Cited (Backward Citations)
US3125619A
Cited
US3294883A
Cited
US3141912A
Cited
US3191225A
Cited
US3202739A
Cited
US3426102A
Cited
US3594862A
Cited
US3721269A
Cited
US3775524A
Cited
US3786221A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-01-26 | 1979-07-28 | 1980-01-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-01-26 | 1983-07-28 | 1984-01-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-01-26 | 1987-07-28 | 1988-01-27 | $7700.00 | Window Closed / Lapsed |