Patent US4289859A successfully refreshed from Google Patents.
US4289859A
Expired / Lapsed
US
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Non-bleeding transparent silicone additives for plastics
Assignee: Dow Silicones Corp
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Filing: 1980-06-02
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Granted: 1981-09-15
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Expires: 2000-06-02
Abstract
Abstract Phenyl containing siloxane fluids are added to transparent thermoplastic polymers to give transparent thermoplastics having improved internal lubrication. For example, PhSi(OMe) 3 is equilibrated with (Me 2 SiO) x to give a fluid containing 28 percent by weight phenyl radicals, a PhSiO 3 /2 to Me 2 SiO ratio of 0.72 and an OMe to Si ratio of 0.78. This fluid was added to polystyrene in amount of 1 percent by weight to give a transparent plastic which exhibits no bleed and had excellent surface lubricity.
Inventors
- 👤 Robert E. Kalinowski
- 👤 Gary A. Vincent
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:26
CPC Classifications
C; C08; C08L; C08L33/00; C08L33/04; C08L33/06; C08G; C08G77/00; C08G77/04; C08L25/00; C08L25/02; C08L25/04; C08L25/06; C08L27/00; C08L27/02; C08L27/04; C08L27/06; C08L67/00; C08L67/02; C08L69/00; C08L83/00; C08L83/04
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
130 words
A transparent thermoplastic composition comprising in admixture a transparent thermoplastic resin selected from the group consisting of polystyrene, polyvinyl chloride, polyethylene terephthalate, polybutylene terephthalate, acrylic polymers, and polycarbonate and a minor amount of a fluid siloxane copolymer composed essentially of phenylsiloxane units of the general formula (RO).sub.x C.sub.6 H.sub.5 SiO.sub.(3-x)/2 and dimethylsiloxane units of the general formula (RO).sub.y (CH.sub.3).sub.2 SiO.sub.(2-y)/2 wherein R represents an alkyl radical having 1 to 6 carbon atoms, x is 2, 1 or 0 and y is 1 or 0, the siloxane copolymer having a ratio of phenylsiloxane units to dimethylsiloxane units in the range of 0.6 to 2, a phenyl radical content above 22 weight percent based on the total weight of the copolymer, and a ratio of alkoxy groups to silicon atoms above 0.3.
Claim 2
Dependent Claim
130 words
A transparent thermoplastic composition comprising in admixture a transparent thermoplastic resin selected from the group consisting of polystyrene, polyvinyl chloride, polyethylene terephthalate, polybutylene terephthalate, acrylic polymers, and polycarbonate and a minor amount of a fluid siloxane copolymer composed essentially of phenylsiloxane units of the general formula (RO).sub.x C.sub.6 H.sub.5 SiO.sub.(3-x)/2 and dimethylsiloxane units of the general formula (RO).sub.y (CH.sub.3).sub.2 SiO.sub.(2-y)/2 wherein R represents an alkyl radical having 1 to 6 carbon atoms, x is 2, 1 or 0 and y is 1 or 0, the siloxane copolymer having a ratio of phenylsiloxane units to dimethylsiloxane units in the range of 0.6 to 2, a phenyl radical content above 22 weight percent based on the total weight of the copolymer, and a ratio of alkoxy groups to silicon atoms above 0.3.
Claim 3
Dependent Claim
29 words
The composition of claim 1 wherein the siloxane copolymer is present in an amount of from 0.1 to 5.0 weight percent based on the weight of the thermoplastic resin.
Claim 4
Dependent Claim
11 words
The composition of claim 1 wherein R represents the methyl radical.
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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) | 1984-09-14 | 1985-03-16 | 1985-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-09-14 | 1989-03-16 | 1989-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-09-14 | 1993-03-16 | 1993-09-15 | $7700.00 | Window Closed / Lapsed |