US3929686A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyisobutylene nucleating agents for expandable styrene polymer compositions
Assignee: Total Petrochemicals and Refining USA Inc
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Filing: 1973-08-31
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Granted: 1975-12-30
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Expires: 1993-08-31
Abstract
Abstract Disclosed are a composition and process for the preparation of expandable styrene polymers wherein low molecular weight isobutylene polymers are employed in an amount of from about 0.02 to about 0.15% by weight based upon the styrene polymer as a nucleating agent to produce an expanded styrene polymer having a very small average cell size.
Inventors
- 👤 John L Stevenson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 04:08
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/0061; C08J2325/00; C08J2423/00; Y; Y10; Y10S; Y10S264/00; Y10S264/05; Y10S264/13; Y10S521/00; Y10S521/908
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
46 words
A COMPOSITION SUITABLE FOR THE PREPARATION OF AN EXPANDED, CELLULAR POLYMERIC PRODUCT, COMPRISING A STYRENE POLYMER; A BLOWING AGENT FOR SAID STYRENE POLYMER AND FROM ABOUT 0.02 TO 0.15% BY WEIGHT BASED UPON SAID STYRENE POLYMER OF A LOW MOLECULAR WEIGHT, LIQUID ISOBUTYLENE POLYMER NUCLEATING AGENT.
Claim 2
Dependent Claim
46 words
A COMPOSITION SUITABLE FOR THE PREPARATION OF AN EXPANDED, CELLULAR POLYMERIC PRODUCT, COMPRISING A STYRENE POLYMER; A BLOWING AGENT FOR SAID STYRENE POLYMER AND FROM ABOUT 0.02 TO 0.15% BY WEIGHT BASED UPON SAID STYRENE POLYMER OF A LOW MOLECULAR WEIGHT, LIQUID ISOBUTYLENE POLYMER NUCLEATING AGENT.
Claim 3
Dependent Claim
21 words
The composition as defined by claim 1, wherein said isobutylene polymer has a molecular weight of from about 500 to 5000.
Claim 4
Dependent Claim
20 words
The composition as defined in claim 1, wherein said isobutylene polymer is a polymer consisting essentially of polymerized isobutylene monomer.
Claim 5
Dependent Claim
13 words
The composition as defined by claim 1, wherein said styrene polymer is homopolystyrene.
Claim 6
Dependent Claim
29 words
The composition as defined by claim 1, wherein said isobutylene polymer is present in an amount of from about 0.05 to 0.1% by weight based on said styrene polymer.
Claim 7
Independent Claim
50 words
A method for the production of foamed styrene polymer products, comprising incorporating into a styrene polymer from about 0.02 to 0.15% by weight based on said polymer of a low molecular weight, liquid isobutylene polymer as a nucleating agent and thereafter expanding said styrene polymer by a suitable blowing means.
Claim 8
Independent Claim
50 words
A method for the production of foamed styrene polymer products, comprising incorporating into a styrene polymer from about 0.02 to 0.15% by weight based on said polymer of a low molecular weight, liquid isobutylene polymer as a nucleating agent and thereafter expanding said styrene polymer by a suitable blowing means.
Claim 9
Dependent Claim
23 words
The method according to claim 6, wherein said isobutylene polymer nucleating agent is incorporated into said styrene polymer during polymerization of said styrene.
Claim 10
Dependent Claim
24 words
The method according to claim 6, wherein said isobutylene polymer nucleating agent is incorporated into said styrene polymer subsequent to polymerization of said styrene.
Claim 11
Dependent Claim
25 words
The method according to claim 6, wherein said styrene polymer is homopolystyrene and said isobutylene polymer is a polymer consisting essentially of polymerized isobutylene monomer.
Claim 12
Dependent Claim
18 words
The meThod according to claim 6, wherein said expansion is accomplished by means of a chemical blowing agent.
Claim 13
Dependent Claim
37 words
The composition as defined by claim 1, wherein said blowing agent is an inorganic blowing agent selected from the group consisting of ferrous oxylate, sodium bicarbonate, ammonium carbonate and a mixture of sodium nitrite and ammonium chloride.
Claim 14
Dependent Claim
36 words
The composition as defined by claim 1, wherein said blowing agent is an organic blowing agent selected from the group consisting of dinitroso-pentamethylene, diazo-amino benzene, p, p''-oxy-bis(benzene sulfonyl hydrazide), alpha-alpha-azo-bix-(isobutyronitrile), 1,1-azo-bis-(cyclohexane carbonitrile), benzo-sulfo-hydrazide, urea and bieret.
Claim 15
Dependent Claim
18 words
The composition as defined by claim 1, wherein said blowing agent is a normally liquid, low boiling hydrocarbon.
Claim 16
Dependent Claim
21 words
The composition as defined by claim 1, wherein said isobutylene polymer has a molecular weight of between about 1000 and 3000.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-12-29 | 1979-06-30 | 1979-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-29 | 1983-06-30 | 1983-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-29 | 1987-06-30 | 1987-12-30 | $7700.00 | Window Closed / Lapsed |