Patent US4197375A successfully refreshed from Google Patents.
US4197375A
Expired / Lapsed
US
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Photodegradability of plastic polyolefins
Assignee: Chevron USA Inc
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Filing: 1978-12-13
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Granted: 1980-04-08
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Expires: 1998-12-13
Abstract
Abstract Plastic polyolefins which are resistant to photodegradation are combined with polyisobutylene to improve photodegradability.
Inventors
- 👤 Richard C. Fox
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:13
CPC Classifications
C; C08; C08L; C08L23/00; C08L23/02; C08K; C08K5/00; C08K5/0008; C08K5/0033; C08L23/04; C08L23/06; C08L23/18; C08L23/20; C08L23/22; C08L2203/00; C08L2203/16; Y; Y10; Y10S; Y10S260/00; Y10S260/43
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
51 words
A method for improving photodegradability of plastic polyolefin compositions which comprises physically contacting plastic polyolefin compositions which are resistant to photodegradation with a minor proportion of polyisobutylene sufficient to accelerate the photodegradation of the plastic polyolefin, said polyisobutylene having a number average molecular weight of from about 400 to about 900.
Claim 2
Independent Claim
51 words
A method for improving photodegradability of plastic polyolefin compositions which comprises physically contacting plastic polyolefin compositions which are resistant to photodegradation with a minor proportion of polyisobutylene sufficient to accelerate the photodegradation of the plastic polyolefin, said polyisobutylene having a number average molecular weight of from about 400 to about 900.
Claim 3
Dependent Claim
22 words
A method according to claim 1 wherein the polyisobutylene has a number average molecular weight of from about 400 to about 700.
Claim 4
Dependent Claim
11 words
A method according to claim 1 wherein the polyolefin is polyethylene.
Claim 5
Dependent Claim
29 words
A method according to claim 3 wherein the polyisobutylene is applied to the surface of the plastic polyethylene by dipping said polyethylene into a hydrocarbon solution of the polyisobutylene.
Claim 6
Dependent Claim
33 words
A method according to claim 4 wherein the polyisobutylene is present on the surface of the plastic polyolefin in an amount from about 1 to 3 percent by weight based on the polyethylene.
References Cited (Backward Citations)
US3523916A
Cited
US3797690A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-04-08 | 1983-10-08 | 1984-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-04-08 | 1987-10-08 | 1988-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-04-08 | 1991-10-08 | 1992-04-08 | $7700.00 | Window Closed / Lapsed |