Patent US4575545A successfully refreshed from Google Patents.
US4575545A
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Terminal cluster acrylate silicones
Assignee: Henkel Loctite Corp
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Filing: 1984-06-22
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Granted: 1986-03-11
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Expires: 2004-06-22
Abstract
Abstract A polyorganosiloxane polymer having a structure represented by one of the formulas (AB).sub.m C or [(AB).sub.m ].sub.n SiR.sub.(4-n) where the R groups are the same or different organic groups other than acrylic groups or groups co-curable therewith; A is a linear polyorganosiloxane segment containing between 3 and about 50 siloxane repeat units at least 3 of which are acrylic groups containing repeat units represented by the formula ##STR1## where R 1 is H or lower alkyl, R 2 is alkylene or alkenylene, and y is 0-4; B is a polyorganopolysiloxane segment represented by the formula ##STR2## where x is an integer of at least 100; C is A or a triorganosilyl group; m is an integer of 1 or more; and n is 3 or 4.
Inventors
- 👤 Steven T. Nakos
- 👤 Samuel Q. S. Lin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:17
CPC Classifications
C; C08; C08C; C08C19/00; C08C19/25; C07; C07F; C07F7/00; C07F7/02; C07F7/08; C07F7/0803; C07F7/081; C07F7/0896; C07F7/18; C07F7/1804; C08F; C08F290/00; C08F290/08; C08F290/12; C08F290/128; C08F299/00; C08G; C08G77/00; C08G77/48; C08G77/50; Y; Y10; Y10S; Y10S528/00; Y10S528/901
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
122 words
A polyorganosiloxane polymer having a structure represented by one of the formulas (AB).sub.m C or [(AB).sub.m ].sub.n SiR.sub.(4-n) where the R groups are the same or different organic groups other than acrylic groups or groups co-curable therewith; A is a linear polyorganosiloxane segment containing between 3 and about 50 siloxane repeat units at least 3 of which are acrylic groups containing repeat units represented by the formula ##STR12## where R 1 is H or lower alkyl, R 2 is alkylene or alkylene; B is a polyorganopolysiloxane segment represented by the formula ##STR13## where x is an integer of at least 100; C is A or a triorganosilyl group; m is an integer of 1 or more; and n is 3 or 4.
Claim 2
Dependent Claim
122 words
A polyorganosiloxane polymer having a structure represented by one of the formulas (AB).sub.m C or [(AB).sub.m ].sub.n SiR.sub.(4-n) where the R groups are the same or different organic groups other than acrylic groups or groups co-curable therewith; A is a linear polyorganosiloxane segment containing between 3 and about 50 siloxane repeat units at least 3 of which are acrylic groups containing repeat units represented by the formula ##STR12## where R 1 is H or lower alkyl, R 2 is alkylene or alkylene; B is a polyorganopolysiloxane segment represented by the formula ##STR13## where x is an integer of at least 100; C is A or a triorganosilyl group; m is an integer of 1 or more; and n is 3 or 4.
Claim 3
Dependent Claim
20 words
The polyorganosiloxane polymer of claim 1 wherein the R groups are selected from substituted or unsubstituted alkyl or aryl groups.
Claim 4
Dependent Claim
18 words
The polyorganosiloxane polymer of claim 2 wherein the R groups are selected from phenyl, methyl and trifluoropropyl groups.
Claim 5
Dependent Claim
13 words
The polyorganosiloxane polymer of claim 1 wherein R 1 is H or methyl.
Claim 6
Dependent Claim
13 words
The polyorganosiloxane polymer of claim 1 wherein R 2 is propylene or propenylene.
Claim 7
Dependent Claim
55 words
The polymer of claim 1 wherein A comprises at least 4 siloxane repeat units at least three of which are said acrylic containing repeat units and at least one of which is represented by the formula ##STR14## wherein R 3 is alkylene or alkenylene and is bound to a silicon atom of the B segment.
Claim 8
Dependent Claim
12 words
The polymer of claim 6 wherein R 3 is ethylene or propylene.
Claim 9
Dependent Claim
19 words
The polymer of claim 1 wherein said A segment is bound to said B segment through an Si-O-Si linkage.
Claim 10
Dependent Claim
58 words
The polymer of claim 8 wherein said polymer is prepared by condensation of an A segment prepolymer having at least 3 said acrylic containing siloxane repeat units and at least one unit of the formula ##STR15## where R 5 is a condensable group and b is 1 or 2 with a silanol terminated silicone of the formula ##STR16##
Claim 11
Dependent Claim
10 words
The polymer of claim 9 wherein R 5 is ##STR17##
Claim 12
Dependent Claim
63 words
The polymer of claim 8 wherein said polymer is prepared by condensation of an A segment prepolymer having at least 3 said acrylic containing siloxane repeat units and at least one unit of the formula ##STR18## where R 5 is a condensable group and b is 1 or 2, with a silanol terminated silicone of the formula ##STR19## and a monofunctional chain stopper.
Claim 13
Dependent Claim
16 words
The polymer of claim 11 wherein said chain stopper is a compound of the formula ##STR20##
Claim 14
Dependent Claim
29 words
The polymer of claim 1 wherein said A segment comprises 30-60% of said acrylic group containing siloxane repeat units and 40-70% of repeat units represented by the formula ##STR21##
Claim 15
Dependent Claim
11 words
The polymer of claim 1 wherein x is at least 160.
Claim 16
Dependent Claim
11 words
The polymer of claim 1 wherein x is at least 300.
Claim 17
Dependent Claim
15 words
The polymer of claim 1 having a viscosity below about 500,000 cps at 25° C.
Claim 18
Dependent Claim
18 words
The polymer of claim 1 wherein said A segment has between 3 and 30 of said siloxane units.
Claim 19
Dependent Claim
16 words
The polymer of claim 17 having between 3 and 20 of said A segment siloxane units.
Claim 20
Dependent Claim
13 words
A crosslinked polyorganosiloxane polymer comprising the free radically cured polymer of claim 1.
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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) | 1989-03-10 | 1989-09-09 | 1990-03-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-03-10 | 1993-09-09 | 1994-03-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-03-10 | 1997-09-09 | 1998-03-11 | $7700.00 | Window Closed / Lapsed |