US4067938A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing multicellular articles
Assignee: BXL Plastics Ltd
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Filing: 1976-07-12
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Granted: 1978-01-10
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Expires: 1996-07-12
Abstract
Abstract A composition which can be formed into a shaped article and stretched to produce a multicellular stretched article comprising a blend of a thermoplastics material and a metal resinate or a resin ester.
Inventors
- 👤 James Jack
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 09:31
CPC Classifications
D; D01; D01D; D01D5/00; D01D5/24; D01D5/247; B; B29; B29C; B29C55/00; B29C55/02; B29C67/00; B29C67/20; B29C67/202; C; C08; C08J; C08J9/00; D01D5/12; D01F; D01F1/00; D01F1/02; D01F1/08; D01F1/10; D21; D21H; D21H13/00; Y; Y10; Y10S; Y10S264/00; Y10S264/17
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
180 words
A process for the production of a multicellular stretched article, which comprises forming a blend of an orientable thermoplastics material and at least one additive, the additive comprising from more than 2 to about 50% by weight, calculated on the weight of the blend, forming a shaped article from the blend and stretching the article uniaxially or biaxially to produce a multicellular stretched article, wherein the additive is selected from metal resinates and modified or unmodified rosin esters which are at least partially incompatible with the thermoplastics material at least so that they form separate phases at the temperature at which the article is to be stretched, the thermoplastics material, when the additive is a metal resinate, being other than a crystalline polyolefin, the blend is formed by blending the thermoplastics material with the additive at a temperature at which both the additive and the thermoplastics material are molten or at least soft, and stretching is effected at a temperature within the normal orientation temperature range for the thermoplastics material, which temperature is below the softening point of the additive.
Claim 2
Dependent Claim
180 words
A process for the production of a multicellular stretched article, which comprises forming a blend of an orientable thermoplastics material and at least one additive, the additive comprising from more than 2 to about 50% by weight, calculated on the weight of the blend, forming a shaped article from the blend and stretching the article uniaxially or biaxially to produce a multicellular stretched article, wherein the additive is selected from metal resinates and modified or unmodified rosin esters which are at least partially incompatible with the thermoplastics material at least so that they form separate phases at the temperature at which the article is to be stretched, the thermoplastics material, when the additive is a metal resinate, being other than a crystalline polyolefin, the blend is formed by blending the thermoplastics material with the additive at a temperature at which both the additive and the thermoplastics material are molten or at least soft, and stretching is effected at a temperature within the normal orientation temperature range for the thermoplastics material, which temperature is below the softening point of the additive.
Claim 3
Dependent Claim
27 words
A process as claimed in claim 1, wherein the thermoplastics material is an olefin polymer or copolymer, a polyester, a polyamide, polystyrene, polyvinyl chloride or polyvinylidene chloride.
Claim 4
Dependent Claim
15 words
A process as claimed in claim 1, wherein the thermoplastics material is a crystalline polymer.
Claim 5
Dependent Claim
15 words
A process as claimed in claim 1, wherein the thermoplastics material is a crystalline polyolefin.
Claim 6
Dependent Claim
25 words
A process as claimed in claim 4, wherein the thermoplastics material is selected from crystalline polyethylene, crystalline polypropylene, crystalline ethylene copolymers and crystalline propylene copolymers.
Claim 7
Dependent Claim
24 words
A process as claimed in claim 1, whenever the thermoplastics material is a high density polyethylene having a density of at least 0.94 gm/cc.
Claim 8
Dependent Claim
32 words
A process as claimed in claim 1, wherein the additive is a metal resinate and is selected from calcium and zinc resinates, mixtures of calcium and zinc resinates and mixed calcium-zinc resinates.
Claim 9
Dependent Claim
28 words
A process as in claim 1, wherein the additive is a rosin ester and is selected from dimerised rosin esters, maleic rosin esters and maleic polymerised rosin esters.
Claim 10
Dependent Claim
24 words
A process as claimed in claim 1, wherein the additive at least in part comprises a separate phase uniformly distributed within the thermoplastics material.
Claim 11
Dependent Claim
22 words
A process as claimed in claim 1, wherein the blend also contains at least one additional additive selected from fillers and pigments.
Claim 12
Dependent Claim
21 words
A process as claimed in claim 1, wherein the additional additive is selected from calcium carbonate titanium dioxide and diatomaceous earth.
Claim 13
Dependent Claim
21 words
A process as claimed in claim 11, wherein the additional additives have a particle size of from 1 to 10 μ.
Claim 14
Dependent Claim
29 words
a process as claimed in claim 11, wherein the additional additive is present in an amount of up to 30% by weight calculated on total weight of the composition.
Claim 15
Dependent Claim
19 words
A process as claimed in claim 1, which also contains an acid binding proportion of an acid binding additive.
Claim 16
Dependent Claim
15 words
A process as claimed in claim 13, wherein the acid binding additive is calcium oxide.
Claim 17
Dependent Claim
32 words
A process as claimed in claim 14, wherein the acid binding additive is present in an amount of from 1 to 20% by weight calculated on the metal resinate or rosin ester.
Claim 18
Dependent Claim
68 words
A process as claimed in claim 11, wherein the blend is a blend of a thermoplastics material, from more than 2 to 50% by weight of an additive selected from metal resinates and rosin esters, and at least one additional additive selected from fillers and pigments, which additional additive will act synergistically with the additive to enhance void formation in the stretched shaped article made from the composition.
Claim 19
Dependent Claim
20 words
A process as claimed in claim 1, wherein the article is a fiber, filament, tape, sheet, film or a tube.
Claim 20
Dependent Claim
22 words
A process as claimed in claim 1, wherein stretching is carried out on a flat bed stretching apparatus for simultaneous biaxial stretching.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-01-09 | 1981-07-11 | 1982-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-01-09 | 1985-07-11 | 1986-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-01-09 | 1989-07-11 | 1990-01-10 | $7700.00 | Window Closed / Lapsed |