US4386187A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermoformable polymer blend composition comprising styrene polymer, olefin polymer and block copolymer
Assignee: SWEETHART CUP COMPANY Inc
•
Filing: 1981-01-16
•
Granted: 1983-05-31
•
Expires: 2001-01-16
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
2026-11-03 15:06
CPC Classifications
C; C08; C08L; C08L23/00; C08L23/02; C08L23/10; C08L25/00; C08L25/02; C08L25/04; C08L25/06; C08L53/00; C08L53/02; C08L2205/00; C08L2205/03
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
77 words
A thermoformable polymer blend composition comprising about 54 to 82% by weight of olefin polymer, about 15 to 40% by weight of styrene polymer and about 2 to 10% 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 about 1.4 to about 22 grams/10 min. under Condition G of ASTM Test D 1238-73.
Claim 2
Dependent Claim
77 words
A thermoformable polymer blend composition comprising about 54 to 82% by weight of olefin polymer, about 15 to 40% by weight of styrene polymer and about 2 to 10% 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 about 1.4 to about 22 grams/10 min. under Condition G of ASTM Test D 1238-73.
Claim 3
Dependent Claim
20 words
A polymer blend composition according to claim 1, wherein said blend comprises about 54 to 82% by weight of polypropylene.
Claim 4
Dependent Claim
20 words
A polymer blend composition according to claim 1, wherein said blend comprises about 54 to 82% by weight of polyethylene.
Claim 5
Dependent Claim
19 words
A polymer blend composition according to claim 1, wherein said styrene polymer is general purpose polystyrene or impact polystyrene.
Claim 6
Dependent Claim
16 words
A polymer blend composition according to claim 1, wherein said styrene polymer is an acrylonitrile-butadiene-styrene copolymer.
Claim 7
Dependent Claim
16 words
A polymer blend composition according to claim 1, wherein said styrene polymer is a styrene-acrylonitrile copolymer.
References Cited (Backward Citations)
CA698750A
Cited
CA658186A
Cited
US2755270A
Cited
US3010935A
Cited
US3012282A
Cited
US3018263A
Cited
GB957368A
Cited
US3210301A
Cited
US3265765A
Cited
US3299174A
Cited
GB1031132A
Cited
US3226453A
Cited
US3452120A
Cited
US3514417A
Cited
US3562790A
Cited
US3444267A
Cited
US3444269A
Cited
GB1114338A
Cited
US3459830A
Cited
US3445543A
Cited
US3538192A
Cited
US3665059A
Cited
US3492372A
Cited
US3630980A
Cited
US3862068A
Cited
US3644249A
Cited
GB1283213A
Cited
US3595942A
Cited
US4031166A
Cited
US3689597A
Cited
US3810957A
Cited
DE2201243C3
Cited
DE2061361C3
Cited
US3894117A
Cited
US3947536A
Cited
US3907929A
Cited
US3868433A
Cited
US3849516A
Cited
US3835201A
Cited
US3825622A
Cited
US3873643A
Cited
DE2400659A1
Cited
US4020025A
Cited
US4075285A
Cited
US4243766A
Cited
US4036912A
Cited
US4101050A
Cited
US4046840A
Cited
US4107130A
Cited
FR2356694B1
Cited
US4076669A
Cited
US4098734A
Cited
US4197377A
Cited
US4188432A
Cited
US4302554A
Cited
US4208315A
Cited
US4239673A
Cited
US4242263A
Cited
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 |