US3686356A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of blending polyorganosiloxane and organic vinylic thermoplastics and products thereof
Assignee: Dow Silicones Corp
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Filing: 1970-08-25
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Granted: 1972-08-22
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Expires: 1990-08-25
Abstract
Abstract A method of blending organic vinylic thermoplastics and polyorganosiloxanes by combining with a copolymer having polyorganosiloxane segments and organic vinylic polymer segments provides a homogeneous dispersion. This gives improved properties of the organic vinylic thermoplastic, such as tensile strength, impact strength, processability, and flow properties.
Inventors
- 👤 John C Saam
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:43
CPC Classifications
C; C08; C08L; C08L53/00; C08F; C08F283/00; C08F283/12; C08G; C08G77/00; C08G77/42; C08G77/442; C08L51/00; C08L51/08; C08L51/085; C08L57/00; C08L83/00; C08L83/04; C08G77/04; C08G77/14; C08G77/16; C08G77/20; C08G77/22; C08G77/24; C08G77/70; Y; Y10; Y10S; Y10S525/00; Y10S525/912; Y10S525/925
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
8 words
The blend prepared in accordance with claim 1.
Claim 2
Dependent Claim
15 words
The method in accordance with claim 1 in which the copolymer is a block copolymer.
Claim 3
Dependent Claim
15 words
The method in accordance with claim 1 in which the copolymer is a graft copolymer.
Claim 4
Dependent Claim
64 words
The method in accordance with claim 3 in which the block copolymer consists essentially of at least one organic vinylic polymer segment selected from the group consisting of homopolymeric and copolymeric segments of styrene, alpha-methylstyrene, vinylchloride, methylmethacrylate and acrylonitrile and at least one polyorganosiloxane segment selected from the group consisting of homopolymer and copolymer segments of polymeric units of dimethylsiloxane, phenylmethylsiloxane, methylvinylsiloxane and methyl-3,3,3-trifluoropropylsiloxane.
Claim 5
Dependent Claim
73 words
The method in accordance with claim 4 in which the graft copolymer consists essentially of at least one organic vinylic polymer segment selected from the group consisting of homopolymeric and copolymeric segments of styrene, alpha-methylstyrene, vinylchloride, methylmethacrylate and acrylonitrile and at least one polyorganosiloxane segment selected from the group consisting of homopolymer and copolymer segments of polymeric units of dimethylsiloxane, phenylmethylsiloxane, methylvinylsiloxane and methyl-3,3,3-trifluoropropylsiloxane wherein the segments are bonded through sulfur or -CH2CH2-.
Claim 6
Dependent Claim
70 words
The method in accordance with claim 6 wherein the graft copolymer is prepared in situ by polymerizing a mixture of vinyl containing organic monomer selected from the group consisting of styrene, alpha-methylstyrene, vinylchloride, methylmethacrylate, and acrylonitrile, a polyorganosiloxane containing reactive silicon bonded groups selected from the group consisting of mercaptoorgano radicals and vinyl radicals and a polyorganosiloxane in the presence of a free radical initiator and thereby obtaining a blend.
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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) | 1975-08-22 | 1976-02-21 | 1976-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-22 | 1980-02-21 | 1980-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-22 | 1984-02-21 | 1984-08-22 | $7700.00 | Window Closed / Lapsed |