US4187360A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat-shrinkable or heat-expandable products from hydrogenated polybutadiene
Assignee: Phillips Petroleum Co
•
Filing: 1975-07-18
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Granted: 1980-02-05
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Expires: 1995-07-18
Abstract
Abstract An article of manufacture having heat-alterable memory characteristics consisting of a shaped, vulcanized composition comprising a hydrogenated polybutadiene which in its unhydrogenated state contains from about 15 to about 55 percent trans 1,4-addition and from about 15 to about 40 percent cis 1,4-addition, the article being in a dimensionally heat-unstable condition capable of altering its physical form upon application of heat alone. The article is produced by hydrogenating the above-described polybutadiene, shaping and vulcanizing the hydrogenated polybutadiene and subjecting the shaped, vulcanized article to a force sufficient to alter its dimensions.
Inventors
- 👤 Thomas A. Peters
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:56
CPC Classifications
C; C08; C08C; C08C19/00; C08C19/02; B; B29; B29C; B29C61/00; B29C61/003; B29K; B29K2009/00
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
119 words
A process for producing a dimensionally heatunstable article which comprises: (a) hydrogenating to 0.01 to about 10 percent residual unsaturation a polybutadiene which, prior to hydrogenation, contains from about 15 to about 55 percent trans 1,4-addition and from about 15 to about 40 percent cis 1,4-addition, and thereafter recovering the resulting hydrogenated polybutadiene; (b) shaping and vulcanizing said hydrogenated polybutadiene, and thereafter recovering the resulting shaped, vulcanized article; and (c) subjecting said shaped, vulcanized article to a force sufficient to alter its dimensions at a temperature between room temperature and 150° C., said force being maintained for a time sufficient to allow the resulting shape-altered article to cool to room temperature, and thereafter recovering the resulting dimensionally heat-unstable article.
Claim 2
Dependent Claim
119 words
A process for producing a dimensionally heatunstable article which comprises: (a) hydrogenating to 0.01 to about 10 percent residual unsaturation a polybutadiene which, prior to hydrogenation, contains from about 15 to about 55 percent trans 1,4-addition and from about 15 to about 40 percent cis 1,4-addition, and thereafter recovering the resulting hydrogenated polybutadiene; (b) shaping and vulcanizing said hydrogenated polybutadiene, and thereafter recovering the resulting shaped, vulcanized article; and (c) subjecting said shaped, vulcanized article to a force sufficient to alter its dimensions at a temperature between room temperature and 150° C., said force being maintained for a time sufficient to allow the resulting shape-altered article to cool to room temperature, and thereafter recovering the resulting dimensionally heat-unstable article.
Claim 3
Dependent Claim
16 words
The process of claim 1 wherein said shaped, vulcanized article is dimensionally altered by stretching same.
Claim 4
Dependent Claim
19 words
The process of claim 2 wherein said article is stretched between 50 and 300 percent of its orginal dimensions.
Claim 5
Dependent Claim
15 words
The process of claim 1 wherein said shaped, vulcanized article is dimensionally altered by compression.
Claim 6
Dependent Claim
20 words
The process of claim 1 wherein said polybutadiene has a molecular weight in the approximate range of 20,000 to 90,000.
Claim 7
Dependent Claim
25 words
The process of claim 1 wherein said polybutadiene in its unvulcanized, unhydrogenated state contains about 19.2 percent trans 1,4-addition and about 19.6 percent cis 1,4-addition.
Claim 8
Dependent Claim
25 words
The process of claim 1 wherein said polybutadiene in its unvulcanized, unhydrogenated state contains about 16.5 percent trans 1,4-addition and about 14.6 percent cis 1,4-addition.
Claim 9
Dependent Claim
25 words
The process of claim 1 wherein said polybutadine in its unvulcanized, unhydrogenated state contains about 30.2 percent trans 1,4-addition and about 23.8 percent cis 1,4-addition.
Claim 10
Dependent Claim
25 words
The process of claim 1 wherein said polybutadiene in its unvulcanized, unhydrogenated state contains about 40.1 percent trans 1,4-addition and about 32.2 percent cis 1,4-addition.
Claim 11
Dependent Claim
25 words
The process of claim 1 wherein said polybutadiene in its unvulcanized, unhydrogenated state contains about 52.7 percent trans 1,4-addition and about 37.5 percent cis 1,4-addition.
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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) | 1983-02-04 | 1983-08-06 | 1984-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-02-04 | 1987-08-06 | 1988-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-02-04 | 1991-08-06 | 1992-02-05 | $7700.00 | Window Closed / Lapsed |