US4696969A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Emulsion polymerized silicone emulsions having siloxane-bonded UV absorbers
Assignee: General Electric Co
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Filing: 1984-07-27
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Granted: 1987-09-29
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Expires: 2004-07-27
Abstract
Abstract An aqueous emulsion composition prepared by emulsion polymerization of a mixture consisting essentially of a polydiorganosiloxane, an emulsifier and an ultraviolet light absorbing agent having the formula ##STR1## wherein X is C═O or ##STR2## Y is H or OH, Z is H, OH, OQ or OW, where at least one Z is OH if Y is H, Q is --CH 2 (CH 2 ) n Si(R 2 ) x (OR 1 ) y and W is --C m H 2m+1 , where x=0, 1 or 2, y=1, 2 or 3, x+y=3, R 1 is an alkyl or alkanoyl radical having 1 to 6 carbon atoms, R 2 is an alkyl radical having 1 to 6 carbon atoms, n=0, 1 or 2 and m=1 to 18; wherein said ultraviolet light absorbing agent is chemically bonded to the polydiorganosiloxane resulting from said emulsion polymerization.
Inventors
- 👤 Raymond J. Thimineur
- 👤 William J. Raleigh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 01:20
CPC Classifications
C; C08; C08L; C08L83/00; C08L83/04; C08L83/06; C08G; C08G77/00; C08G77/04; C08G77/14; C08G77/22; C08G77/26
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
95 words
A method for making an emulsion substantially free of amino-functional units and having a substantially neutral or acidic pH, comprising: I. preparing an aqueous emulsion consisting essentially of: (a) a low molecular weight polydiorganosiloxane, (b) an emulsifier or mixture of emulsifiers, II. partially polymerizing said low molecular weight polydiorganosiloxane by emulsion polymerization; III. adding to the partially emulsion polymerized polydiorganosiloxane an ultraviolet light absorbing agent, and IV. emulsion polymerizing the polydiorganosiloxane of the emulsion of step III such that the ultraviolet light absorbing agent is chemically bonded to the polydiorganosiloxane prepared by said emulsion polymerization.
Claim 2
Independent Claim
95 words
A method for making an emulsion substantially free of amino-functional units and having a substantially neutral or acidic pH, comprising: I. preparing an aqueous emulsion consisting essentially of: (a) a low molecular weight polydiorganosiloxane, (b) an emulsifier or mixture of emulsifiers, II. partially polymerizing said low molecular weight polydiorganosiloxane by emulsion polymerization; III. adding to the partially emulsion polymerized polydiorganosiloxane an ultraviolet light absorbing agent, and IV. emulsion polymerizing the polydiorganosiloxane of the emulsion of step III such that the ultraviolet light absorbing agent is chemically bonded to the polydiorganosiloxane prepared by said emulsion polymerization.
Claim 3
Dependent Claim
111 words
A method as in claim 1 wherein the ultraviolet light absorbing agent has the formula ##STR12## wherein X is ##STR13## Y is H or OH, Z is H, OH, OQ or OW, where at least one Z is OH if Y is H, Q is --CH 2 (CH 2 ) n Si(R 2 ) x (OR 1 ) y and W is --C m H 2m+1 , where x=0, 1 or 2, y=1, 2 or 3, x+y=3, R 1 is an alkyl or alkanoyl radical having 1 to 6 carbon atoms, R 2 is an alkyl radical having 1 to 6 carbon atoms, n=0, 1 or 2 and m=1 to 18.
Claim 4
Dependent Claim
18 words
A method as in claim 1 wherein the low molecular weight polydiorganosiloxane of step I is a cyclopolysiloxane.
Claim 5
Dependent Claim
16 words
A method as in claim 2 wherein the ultraviolet light absorbing agent has the formula ##STR14##
Claim 6
Dependent Claim
16 words
A method as in claim 2 wherein the ultraviolet light absorbing agent has the formula ##STR15##
Claim 7
Dependent Claim
19 words
A method as in claim 1 wherein the emulsion polymerization is carried out in the presence of a catalyst.
Claim 8
Dependent Claim
23 words
A method as in claim 1 wherein the aqueous emulsion of step I further consists essentially of an alkyltrialkoxysilane or mixture of alkyltrialkoxysilanes.
Claim 9
Dependent Claim
11 words
A method as in claim 7 wherein the alkyltrialkoxysilane is methyltrimethoxysilane.
Claim 10
Dependent Claim
21 words
A method as in claim 1 wherein an alkyltrialkoxysilane or mixture of trialkoxysilanes is added after the ultraviolet light absorbing agent.
Claim 11
Independent Claim
171 words
A method of making an emulsion substantially free of aminofunctional units and having a substantially neutral or acidic pH, comprising: I. preparing an aqueous emulsion consisting essentially of: (a) a low molecular weight polydiorganosiloxane and (b) an emulsifier or mixture of emulsifiers; II. partially polymerizing said low molecular weight polydiorganosiloxane by emulsion polymerization; III. adding to the partially emulsion polymerized polydiorganosiloxane an ultraviolet light absorbing agent of the formula ##STR16## wherein X is ##STR17## Y is H or OH, Z is H, OH, OQ or OW, where at least one Z is OH if Y is H, Q is --CH 2 (CH 2 ) n Si(R 2 ) x (OR 1 ) y and W is --C m H 2m+1 , where x=0, 1 or 2, y=1, 2 or 3, x+y=3, R 1 is an alkyl or alkanoyl radical having 1 to 6 carbon atoms, R 2 is an alkyl radical having 1 to 6 carbon atoms, n=0, 1 or 2 and m=1 to 18; and IV. continuing the emulsion polymerization.
Claim 12
Independent Claim
171 words
A method of making an emulsion substantially free of aminofunctional units and having a substantially neutral or acidic pH, comprising: I. preparing an aqueous emulsion consisting essentially of: (a) a low molecular weight polydiorganosiloxane and (b) an emulsifier or mixture of emulsifiers; II. partially polymerizing said low molecular weight polydiorganosiloxane by emulsion polymerization; III. adding to the partially emulsion polymerized polydiorganosiloxane an ultraviolet light absorbing agent of the formula ##STR16## wherein X is ##STR17## Y is H or OH, Z is H, OH, OQ or OW, where at least one Z is OH if Y is H, Q is --CH 2 (CH 2 ) n Si(R 2 ) x (OR 1 ) y and W is --C m H 2m+1 , where x=0, 1 or 2, y=1, 2 or 3, x+y=3, R 1 is an alkyl or alkanoyl radical having 1 to 6 carbon atoms, R 2 is an alkyl radical having 1 to 6 carbon atoms, n=0, 1 or 2 and m=1 to 18; and IV. continuing the emulsion polymerization.
Claim 13
Dependent Claim
26 words
A method as in claim 1 further comprising adding an alkyltrialkoxysilane after step IV and thereafter continuing the emulsion polymerization until the desired viscosity is obtained.
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) | 1990-09-28 | 1991-03-30 | 1991-09-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-09-28 | 1995-03-30 | 1995-09-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-09-28 | 1999-03-30 | 1999-09-29 | $7700.00 | Window Closed / Lapsed |