EP0380875A2
Expired / Lapsed
EP
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Elastomer-forming compositions
Assignee: Dow Silicones Deutschland GmbH
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Filing: 1989-12-06
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Granted: —
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Expires: 2009-12-06
Abstract
Abstract This invention discloses elastomer-forming compositions which have a low viscosity in the uncured state whilst retaining good physical properties when cured. They comprise an α,ω hydroxyl, trialkoxy or alkylenetrial- koxy end-blocked polydiorganosiloxane, a MQ silicone resin having tetrafunctional units of the formula Si0 2 and monovalent units of the formula R a R' 3-a SiO ½ wherein R denotes a group of the general formula -R"Si(OR*) 3 , with R being an alkylene group and R * an alkyl group and wherein a has a value of 2 or 3, preferably 2 for up to 30% of all monovalent units and a titanium catalyst.
Inventors
- 👤 Andre Rudolf Louis Colas
- 👤 Klaus Markus Geilich
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-05 05:23
CPC Classifications
C; C08; C08L; C08L83/00; C08L83/04; C08L83/14; C08G; C08G77/00; C08G77/04; C08G77/14; C08G77/16; C08G77/18; C08G77/20; C08G77/70; C08G77/80
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
187 words
An organosilicon composition which upon curing forms an elastomer comprising (i) a diorganopolysiloxane of which each terminal group has the general formula -Si(Z) 2 O, wherein each Z denotes an organic group consisting of C, H and optionally O atoms and Q is selected from the group consisting of -OH. -OSi(OR*) 3 , -R"Si(OR') 3 and -R"Si(Z) 2 OSi(Z) 2 R"(OR*) 3 wherein R" is a divalent alkylene group having up to 10 carbon atoms in the chain linking the two silicon atoms together, R' is an alkyl group having up to 8 carbon atoms, (ii) a MQ resin and (iii) a titanium catalyst characterised in that the MQ resin consists essentially of tetravalent units of the general formula Si0 4/2 and monovalent units of the general formula R a R' 3-a SiO ½ wherein R denotes an alkyl or an aryl group having from 1 to 8 carbon atoms, R is a group of the general formula -R Si(OR') 3 wherein R and R' are as defined above and a has a value of 2 or 3, there being at least one R group per molecule.
Claim 2
Dependent Claim
187 words
An organosilicon composition which upon curing forms an elastomer comprising (i) a diorganopolysiloxane of which each terminal group has the general formula -Si(Z) 2 O, wherein each Z denotes an organic group consisting of C, H and optionally O atoms and Q is selected from the group consisting of -OH. -OSi(OR*) 3 , -R"Si(OR') 3 and -R"Si(Z) 2 OSi(Z) 2 R"(OR*) 3 wherein R" is a divalent alkylene group having up to 10 carbon atoms in the chain linking the two silicon atoms together, R' is an alkyl group having up to 8 carbon atoms, (ii) a MQ resin and (iii) a titanium catalyst characterised in that the MQ resin consists essentially of tetravalent units of the general formula Si0 4/2 and monovalent units of the general formula R a R' 3-a SiO ½ wherein R denotes an alkyl or an aryl group having from 1 to 8 carbon atoms, R is a group of the general formula -R Si(OR') 3 wherein R and R' are as defined above and a has a value of 2 or 3, there being at least one R group per molecule.
Claim 3
Dependent Claim
28 words
An organosilicon composition according to Claim 1 characterised in that in Component (ii) from 0.1 to 30% of all monovalent units have a value of a = 2.
Claim 4
Dependent Claim
30 words
An organosilicon composition according to either Claim 1 or Claim 2 characterised in that in Component (ii) the ratio of monovalent units to tetravalent units is from 0.4:1 to 2:1.
Claim 5
Dependent Claim
25 words
An organosilicon composition according to Claim 3 characterised in that in Component (ii) the ratio of monovalent units to tetravalent units is greater than 1.2:1.
Claim 6
Dependent Claim
31 words
An organosilicon composition according to any one of the preceding claims characterised in that in Component (ii) each R is a dimethylene group and each R * is a methyl group.
Claim 7
Dependent Claim
33 words
An organosilicon composition according to any one of the preceding claims characterised in that Component (i) has a viscosity at 25° C of from 1000 mm 2 1s to 0.1 m 2 /s.
Claim 8
Dependent Claim
47 words
An organosilicon composition according to any one of the preceding claims characterised in that Component (i) is an α,ω hydroxyl end-blocked polydimethyl siloxane and the titanium compound has the formula [(CH 3 ) 2 CHO] 2 Ti[CH 3 C(O) = CH(O)C 2 H 5 ] 2 .
Claim 9
Dependent Claim
35 words
An organosilicon composition according to any one of Claims 1 to 6 characterised in that Component (i) is an α,ω -R"Si(Z) 2 OSi(Z) 2 R"Si(OR*) 3 end-blocked polydimethyl siloxane and the titanium compound is tetrapropyltitanate.
Claim 10
Dependent Claim
34 words
An organosilicon composition according to any one of the preceding claims characterised in that it comprises from 20 to 100 parts by weight of Component (ii) per 100 parts by weight of Component (i).
Claim 11
Dependent Claim
22 words
An organosilicon composition according to any one of the preceding claims characterised in that the catalyst is an organotitanate having titanium-oxygen bonds.
References Cited (Backward Citations)
No citation records indexed.
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