US4386188A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermoformable polymer blend composition
Assignee: SWEETHART CUP COMPANY Inc
•
Filing: 1982-02-24
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Granted: 1983-05-31
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Expires: 2002-02-24
Abstract
Abstract A thermoformable polymer blend composition comprising at least 50% by weight of an olefin polymer such as polyethylene or polypropylene, from 10 to 48% by weight of a styrene polymer and from 2 to 40% by weight of a thermoplastic styrenic block copolymer rubber, preferably a styrene-butadiene-styrene block copolymer, which acts as a compatibilizer for the olefin and styrene polymers in the blend. This blend can be formed on conventional machinery to give products having the beneficial properties of both types of polymers.
Inventors
- 👤 Michael R. Grancio
- 👤 David F. Stewart
- 👤 John F. Cass
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:32
CPC Classifications
C; C08; C08L; C08L23/00; C08L23/02; C08L23/10; C08L25/00; C08L25/02; C08L25/04; C08L25/06; C08L53/00; C08L2205/00; C08L2205/03
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
123 words
A process for molding articles having a desired shape which comprises feeding a thermoplastic sheet formed from a polymer blend comprising at least 50% by weight of olefin polymer, from 10 to 48% by weight of styrene polymer and from 2 to 20% by weight of a thermoplastic styrene-butadiene-styrene block copolymer rubber compatibilizer, said compatibilizer having a softness parameter of greater than about 200 psi in terms of the 300% modulus and a melt index of at least about 1.4 grams/10 min. under Condition G of ASTM Test D1238-73, to a heating station where it is heated to its softening point, advancing the heated sheet to a forming station having molds of said desired shape, and molding the sheet within said forming station.
Claim 2
Dependent Claim
123 words
A process for molding articles having a desired shape which comprises feeding a thermoplastic sheet formed from a polymer blend comprising at least 50% by weight of olefin polymer, from 10 to 48% by weight of styrene polymer and from 2 to 20% by weight of a thermoplastic styrene-butadiene-styrene block copolymer rubber compatibilizer, said compatibilizer having a softness parameter of greater than about 200 psi in terms of the 300% modulus and a melt index of at least about 1.4 grams/10 min. under Condition G of ASTM Test D1238-73, to a heating station where it is heated to its softening point, advancing the heated sheet to a forming station having molds of said desired shape, and molding the sheet within said forming station.
Claim 3
Dependent Claim
18 words
The process of claim 1, wherein the thermoplastic sheet is fed from a roll of said sheet material.
Claim 4
Dependent Claim
14 words
The process of claim 1, wherein the thermoplastic sheet is continuously formed by extrusion.
Claim 5
Dependent Claim
45 words
The process of claim 1, wherein said polymer blend comprises from 54 to 82% by weight of polyethylene or polypropylene, from 15 to 40% by weight of a styrene polymer and from 2 to 10% by weight of said thermoplastic styrene-butadiene-styrene block copolymer rubber compatibilizer.
Claim 6
Dependent Claim
16 words
The process of claim 4, wherein said styrene polymer is general purpose polystyrene or impact polystyrene.
Claim 7
Dependent Claim
13 words
The process of claim 4, wherein said styrene polymer is an acrylonitrile-butadiene-styrene copolymer.
Claim 8
Dependent Claim
13 words
The process of claim 4, wherein said styrene polymer is a styrene-acrylonitrile copolymer.
Claim 9
Dependent Claim
11 words
The process of claim 1, wherein said olefin polymer is polypropylene.
Claim 10
Dependent Claim
11 words
The process of claim 1, wherein said olefin polymer is polyethylene.
Claim 11
Dependent Claim
85 words
A process for molding articles having a desired shape which comprises injection molding a polymer blend comprising at least 50% by weight of olefin polymer, from 10 to 48% by weight of styrene polymer and from 2 to 20% by weight of a thermoplastic styrene-butadiene-styrene block copolymer rubber compatibilizer, said compatibilizer having a softness parameter of greater than about 200 psi in terms of the 300% modulus and a melt index of at least about 1.4 grams/10 min. under Condition G of ASTM Test D1238-73.
Claim 12
Dependent Claim
85 words
A process for molding articles having a desired shape which comprises injection molding a polymer blend comprising at least 50% by weight of olefin polymer, from 10 to 48% by weight of styrene polymer and from 2 to 20% by weight of a thermoplastic styrene-butadiene-styrene block copolymer rubber compatibilizer, said compatibilizer having a softness parameter of greater than about 200 psi in terms of the 300% modulus and a melt index of at least about 1.4 grams/10 min. under Condition G of ASTM Test D1238-73.
Claim 13
Dependent Claim
45 words
The process of claim 10, wherein said polymer blend comprises from 54 to 82% by weight of polyethylene or polypropylene, from 15 to 40% by weight of a styrene polymer and from 2 to 10% by weight of said thermoplastic styrene-butadiene-styrene block copolymer rubber compatibilizer.
Claim 14
Dependent Claim
107 words
A process for molding articles having a desired shape which comprises feeding a thermoplastic sheet formed from a polymer blend comprising at least 50% by weight of olefin polymer, from 10 to 48% by weight of styrene polymer and from 2 to 20% by weight of a thermoplastic styrene-butadiene-styrene block copolymer rubber compatibilizer, said compatibilizer having a softness parameter of greater than about 200 psi in terms of the 300% modulus and a melt index of at least about 1.4 grams/10 min. under Condition G of ASTM Test D1238-73, to a forming station having molds of said desired shape, and molding the sheet within said forming station.
Claim 15
Dependent Claim
107 words
A process for molding articles having a desired shape which comprises feeding a thermoplastic sheet formed from a polymer blend comprising at least 50% by weight of olefin polymer, from 10 to 48% by weight of styrene polymer and from 2 to 20% by weight of a thermoplastic styrene-butadiene-styrene block copolymer rubber compatibilizer, said compatibilizer having a softness parameter of greater than about 200 psi in terms of the 300% modulus and a melt index of at least about 1.4 grams/10 min. under Condition G of ASTM Test D1238-73, to a forming station having molds of said desired shape, and molding the sheet within said forming station.
Claim 16
Dependent Claim
45 words
The process of claim 12, wherein said polymer blend comprises from 54 to 82% by weight of polyethylene or polypropylene, from 15 to 40% by weight of a styrene polymer and from 2 to 10% by weight of said thermoplastic styrene-butadiene-styrene block copolymer rubber compatibilizer.
Claim 17
Dependent Claim
9 words
Molded articles produced by the process of claim 1.
Claim 18
Dependent Claim
9 words
Molded articles produced by the process of claim 10.
Claim 19
Dependent Claim
9 words
Molded articles produced by the process of claim 12.
Claim 20
Dependent Claim
90 words
A process for producing a thermoformable polymer sheet which comprises mixing a polymer blend comprising at least 50% by weight of olefin polymer, from 10 to 48% by weight of a styrene polymer and from 2 to 20% by weight of thermoplastic styrene-butadiene-styrene block copolymer rubber compatibilizer, said compatibilizer having a softness parameter of greater than about 200 psi in terms of the 300% modulus and a melt index of at least about 1.4 grams/10 min. under Condition G of ASTM Test D1238-73, and forming a sheet therefrom by extrusion.
Claim 21
Dependent Claim
90 words
A process for producing a thermoformable polymer sheet which comprises mixing a polymer blend comprising at least 50% by weight of olefin polymer, from 10 to 48% by weight of a styrene polymer and from 2 to 20% by weight of thermoplastic styrene-butadiene-styrene block copolymer rubber compatibilizer, said compatibilizer having a softness parameter of greater than about 200 psi in terms of the 300% modulus and a melt index of at least about 1.4 grams/10 min. under Condition G of ASTM Test D1238-73, and forming a sheet therefrom by extrusion.
Claim 22
Dependent Claim
45 words
The process of claim 17, wherein said polymer blend comprises from 54 to 82% by weight of polyethylene or polypropylene, from 15 to 40% by weight of a styrene polymer and from 2 to 10% by weight of said thermoplastic styrene-butadiene-styrene block copolymer rubber compatibilizer.
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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) | 1986-05-30 | 1986-11-29 | 1987-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-05-30 | 1990-11-29 | 1991-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-05-30 | 1994-11-29 | 1995-05-31 | $7700.00 | Window Closed / Lapsed |