US4070414A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Toughened mercaptosiloxane modified bulk polymerized vinylic polymers
Assignee: Dow Silicones Corp
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Filing: 1976-04-23
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Granted: 1978-01-24
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Expires: 1996-04-23
Abstract
Abstract Improvement in impact strength of certain vinylic polymers is obtained by dissolving a mercaptosiloxane-dimethylsiloxane copolymer in a vinylic monomer and converting the monomer to a polymer by bulk or suspension polymerization in the presence of a free radical generator. For example, a copolymer of mercaptopropylmethylsiloxane and dimethylsiloxane is dissolved in styrene and the styrene is copolymerized with acrylonitrile in bulk and/or in water suspension using benzoyl peroxide as a catalyst.
Inventors
- 👤 James R. Falender
- 👤 John C. Saam
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 09:20
CPC Classifications
C; C08; C08F; C08F283/00; C08F283/12; C08F283/124
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
19 words
A composition of matter consisting essentially of a matrix of 1. a thermoplastic vinylic polymer having dispersed therein 2.
Claim 2
Dependent Claim
19 words
A composition of matter consisting essentially of a matrix of 1. a thermoplastic vinylic polymer having dispersed therein 2.
Claim 3
Dependent Claim
195 words
gel particles of a rubbery organopolysiloxane, (1) being selected from the group consisting of polymethyl methacrylate, copolymers of methyl methacrylate with minor amounts of other vinylic monomers and copolymers of a styrenic monomer with minor amounts of a monomer selected from the group consisting of acrylonitrile monomers, 1,4-butadienes, acrylate monomers, vinyl acetate and vinyl halides, (2) being formed from a copolymer dispersible in at least one of the monomers from which (1) is prepared, (2) containing from 0.001 to 10 mol percent siloxane units of the formula HSRSi(R') n O 3-n/2 in which R has 1 to 8 carbon atoms and is a divalent saturated aliphatic hydrocarbon radical or a trivalent saturated aliphatic hydrocarbon radical in which two valences are satisfied by the same silicon atom, n is 0 to 2 and R' is a monovalent hydrocarbon radical free of aliphatic unsaturation of 1 to 8 carbon atoms, the remainder of (2) being essentially all dimethylsiloxane, the proportion of (2) being from 1 to 40 percent by weight based on the combined weights of (1) and (2) said composition having been prepared by bulk or suspension polymerization of at least one monomer (1) having (2)
Claim 4
Dependent Claim
195 words
gel particles of a rubbery organopolysiloxane, (1) being selected from the group consisting of polymethyl methacrylate, copolymers of methyl methacrylate with minor amounts of other vinylic monomers and copolymers of a styrenic monomer with minor amounts of a monomer selected from the group consisting of acrylonitrile monomers, 1,4-butadienes, acrylate monomers, vinyl acetate and vinyl halides, (2) being formed from a copolymer dispersible in at least one of the monomers from which (1) is prepared, (2) containing from 0.001 to 10 mol percent siloxane units of the formula HSRSi(R') n O 3-n/2 in which R has 1 to 8 carbon atoms and is a divalent saturated aliphatic hydrocarbon radical or a trivalent saturated aliphatic hydrocarbon radical in which two valences are satisfied by the same silicon atom, n is 0 to 2 and R' is a monovalent hydrocarbon radical free of aliphatic unsaturation of 1 to 8 carbon atoms, the remainder of (2) being essentially all dimethylsiloxane, the proportion of (2) being from 1 to 40 percent by weight based on the combined weights of (1) and (2) said composition having been prepared by bulk or suspension polymerization of at least one monomer (1) having (2)
Claim 5
Dependent Claim
38 words
dispersed therein, in the presence of a free radical generator. 2. The composition of claim 1 in which (2) additionally contains up to 30 mol percent of alkenylsiloxane where the alkenyl group contains 2 to 4 carbon atoms.
Claim 6
Dependent Claim
15 words
The composition of claim 1 in which (2) is a copolymer of 3-mercaptopropylmethylsiloxane and dimethylsiloxane.
Claim 7
Dependent Claim
16 words
The composition of claim 2 in which (2) is a blend of mercaptopropylmethyl-dimethylsiloxane and vinylmethyl-dimethylsiloxane copolymers.
Claim 8
Dependent Claim
16 words
The composition of claim 2 in which (2) is a copolymer of dimethylpolysiloxane, mercaptopropylmethylsiloxane and vinylmethylsiloxane.
Claim 9
Dependent Claim
15 words
The composition of claim 1 in which (1) is a copolymer of styrene and acrylonitrile.
Claim 10
Dependent Claim
11 words
The composition of claim 1 in which (1) is polymethyl methacrylate.
Claim 11
Dependent Claim
21 words
The composition of claim 1 in which the mercaptosiloxane units in (2) are in amount from 0.5 to 5 mol percent.
Claim 12
Dependent Claim
24 words
The composition of claim 8 in which (1) is a copolymer of styrene and acrylonitrile and (2) is a copolymer of mercaptopropylmethylsiloxane and dimethylsiloxane.
Claim 13
Dependent Claim
19 words
The composition of claim 8 where (1) is polymethyl methacrylate and (2) is a copolymer of mercaptopropylmethylsiloxane and dimethylsiloxane.
Claim 14
Dependent Claim
19 words
The composition of claim 1 in which (2) is present in amount of 5 to 30 percent by weight.
Claim 15
Dependent Claim
19 words
The composition of claim 2 in which (2) is present in amount of 5 to 30 percent by weight.
Claim 16
Dependent Claim
19 words
The composition of claim 3 in which (2) is present in amount of 5 to 30 percent by weight.
Claim 17
Dependent Claim
19 words
The composition of claim 4 in which (2) is present in amount of 5 to 30 percent by weight.
Claim 18
Dependent Claim
19 words
The composition of claim 5 in which (2) is present in amount of 5 to 30 percent by weight.
Claim 19
Dependent Claim
19 words
The composition of claim 6 in which (2) is present in amount of 5 to 30 percent by weight.
Claim 20
Dependent Claim
19 words
The composition of claim 7 in which (2) is present in amount of 5 to 30 percent by weight.
Claim 21
Dependent Claim
19 words
The composition of claim 8 in which (2) is present in amount of 5 to 30 percent by weight.
Claim 22
Dependent Claim
19 words
The composition of claim 9 in which (2) is present in amount of 5 to 30 percent by weight.
Claim 23
Dependent Claim
19 words
The composition of claim 10 in which (2) is present in amount of 5 to 30 percent by weight.
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) | 1981-01-23 | 1981-07-25 | 1982-01-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-01-23 | 1985-07-25 | 1986-01-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-01-23 | 1989-07-25 | 1990-01-24 | $7700.00 | Window Closed / Lapsed |