US4017427A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fast cooling styrene polymer foams
Assignee: Atlantic Richfield Co
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Filing: 1975-05-30
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Granted: 1977-04-12
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Expires: 1995-05-30
Abstract
Abstract Expandable styrene polymer particles which have fast cooling rates during molding are produced by suspending styrene polymer particles in an aqueous medium and impregnating a blowing agent into the particles in the presence of 0.05 to 0.4 parts of silicone surfactant per 100 parts of polymer particles. The silicone surfactant is selected from the siloxane-oxyalkylene copolymers having at least one polysiloxane block which contains mers of the general formula R 2 SiO, where R is selected from the group consisting of alkyl having 1 to 4 carbon atoms and halogenated alkyl having 1 to 4 carbon atoms, and at least one polyoxyalkylene block containing mers of general formula C n H 2n O, where n is 2, 3 or 4, attached to said polysiloxane block and terminated by hydroxyl groups.
Inventors
- 👤 Jose E. Granda
- 👤 John J. Quinlan
- 👤 James J. Garland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 15:13
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/0061; C08J9/16; C08J9/18; C08J2325/00; C08J2483/00
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
164 words
Method of making foamable styrene polymer particles which yield a fast cooling foamed molding comprising the steps of: a. suspending styrene polymer particles in water with the aid of a suspending agent system; b. adding 3 to 20 weight percent of a blowing agent and 0.05 to 0.4 weight percent of a silicone surfactant selected from the siloxane-oxyalkylene copolymers having (1) at least one polysiloxane block which contains mers of the general formula R 2 SiO where R is selected from the group consisting of alkyl having 1 to 4 carbon atoms and halogenated alkyl having 1 to 4 carbon atoms, and (2) at least one polyoxyalkylene block attached to said polysiloxane block, and terminated by hydroxyl groups, and containing mers of general formula C n H 2n O, where n is 2, 3 or 4; c. heating the suspension at a temperature of from 80° to 150° C. to impregnate the polymer particles; and d. separating the impregnated particles from the aqueous system.
Claim 2
Dependent Claim
164 words
Method of making foamable styrene polymer particles which yield a fast cooling foamed molding comprising the steps of: a. suspending styrene polymer particles in water with the aid of a suspending agent system; b. adding 3 to 20 weight percent of a blowing agent and 0.05 to 0.4 weight percent of a silicone surfactant selected from the siloxane-oxyalkylene copolymers having (1) at least one polysiloxane block which contains mers of the general formula R 2 SiO where R is selected from the group consisting of alkyl having 1 to 4 carbon atoms and halogenated alkyl having 1 to 4 carbon atoms, and (2) at least one polyoxyalkylene block attached to said polysiloxane block, and terminated by hydroxyl groups, and containing mers of general formula C n H 2n O, where n is 2, 3 or 4; c. heating the suspension at a temperature of from 80° to 150° C. to impregnate the polymer particles; and d. separating the impregnated particles from the aqueous system.
Claim 3
Dependent Claim
12 words
The method of claim 1 wherein said styrene polymer particles are polystyrene.
Claim 4
Dependent Claim
21 words
The method of claim 1 wherein said styrene polymer particles are a copolymer of styrene with minor amounts of maleic anhydride.
Claim 5
Dependent Claim
20 words
The method of claim 1 wherein said styrene polymer particles are a copolymer of styrene with minor amounts of acrylonitrile.
Claim 6
Dependent Claim
22 words
The method of claim 1 wherein said styrene polymer particles are a copolymer of styrene with minor amounts of methyl acid maleate.
Claim 7
Dependent Claim
48 words
The method of claim 1 wherein said silicone surfactant is a dimethylsiloxane-oxyalkylene copolymer having a number average molecular weight of between 1400 and 3000, of which the polyoxyalkylene blocks make up between 90 and 1000, and the polyoxyalkylene blocks contain at least 75% by weight of ethylene oxide.
Claim 8
Dependent Claim
148 words
A composition consisting essentially of particles of a styrene polymer containing dispersed throughout 3 to 20 weight percent of a blowing agent and 0.05 to 0.4 weight percent of a silicone surfactant, said surfactant being dispersed by impregnation into the polymer with the blowing agent, and said surfactant being a siloxane-oxyalkylene copolymer having (1) at least one polysiloxane block which contains mers of the general formula R 2 SiO where R is selected from the group consisting of alkyl having 1 to 4 carbon atoms and halogenated alkyl having 1 to 4 carbon atoms, and (2) at least one polyoxyalkylene block attached to said polysiloxane block, and terminated by hydroxyl groups and containing mers of general formula C n H 2n O, where n is 2,3, or 4; said particles being fast cooling during molding in thick-section billets that are greater than one foot in the smallest dimension.
Claim 9
Dependent Claim
148 words
A composition consisting essentially of particles of a styrene polymer containing dispersed throughout 3 to 20 weight percent of a blowing agent and 0.05 to 0.4 weight percent of a silicone surfactant, said surfactant being dispersed by impregnation into the polymer with the blowing agent, and said surfactant being a siloxane-oxyalkylene copolymer having (1) at least one polysiloxane block which contains mers of the general formula R 2 SiO where R is selected from the group consisting of alkyl having 1 to 4 carbon atoms and halogenated alkyl having 1 to 4 carbon atoms, and (2) at least one polyoxyalkylene block attached to said polysiloxane block, and terminated by hydroxyl groups and containing mers of general formula C n H 2n O, where n is 2,3, or 4; said particles being fast cooling during molding in thick-section billets that are greater than one foot in the smallest dimension.
Claim 10
Dependent Claim
47 words
The composition of claim 7 wherein the silicone surfactant is s dimethylsiloxane-oxyalkylene copolymer having a number average molecular weight between 1400 and 3000, of which the polyoxyalkylene blocks make up between 90 and 1000, and the polyoxyalkylene blocks contain at least 75 weight percent of ethylene oxide.
Claim 11
Dependent Claim
11 words
The composition of claim 7 wherein the styrene polymer is polystyrene.
Claim 12
Dependent Claim
19 words
The composition of claim 7 wherein the styrene polymer is a copolymer of styrene with minor amounts of acrylonitrile.
Claim 13
Dependent Claim
20 words
The composition of claim 7 wherein the styrene polymer is a copolymer of styrene with minor amounts of maleic anhydride.
Claim 14
Dependent Claim
21 words
The composition of claim 7 wherein the styrene polymer is a copolymer of styrene with minor amounts of methyl acid maleate.
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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) | 1980-04-11 | 1980-10-11 | 1981-04-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-04-11 | 1984-10-11 | 1985-04-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-04-11 | 1988-10-11 | 1989-04-12 | $7700.00 | Window Closed / Lapsed |