EP0169529A2
Expired / Lapsed
EP
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Curable organopolysiloxane compositions
Assignee: Wacker Chemical Corp
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Filing: 1985-07-23
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Granted: —
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Expires: 2005-07-23
Abstract
Abstract An organopolysiloxane composition which has improved adhesion and is curable at an elevated temperature in the presence of atmospheric moisture comprising:(a) An organopolysiloxane having an average of at least two hydroxyl groups per molecule;(b) an organosilicon compound containing at least two hydrolyzable groups per molecule which is capable of reacting with the hydroxyl groups of the organopolysiloxane.(c) an organohydrogenpolysiloxane containing at least one silicon-bonded hydrogen atom per molecule;(d) a platinum catalyst; and(e) if desired, a condensation catalyst.The resultant composition is generally heated to an elevated temperature to form an elastomer.
Inventors
- 👤 Richard C. Mcafee
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 13:26
CPC Classifications
C; C08; C08L; C08L83/00; C08L83/04; C08G; C08G77/00; C08G77/04; C08G77/12; C08G77/14; C08G77/16; C08G77/18; C08G77/20; C08G77/22; C08G77/26; C08G77/42; C08G77/44
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
84 words
An organopolysiloxane composition which forms an elastomer at an elevated temperature comprising: (a) An organopolysiloxane having an average of at least two hydroxyl groups per molecule, (b) an organosilicon compound having an average of at least two hydrolyzable groups per molecule, said hydrolyzable groups are selected from the group consisting of acyloxy groups, aminoxy groups, amine groups, acylamine groups, oxime groups and mixtures thereof, (c) an organohydrogenpolysiloxane having an average of at least one silicon-bonded hydrogen atom per molecule, and (d) a platinum catalyst.
Claim 2
Dependent Claim
84 words
An organopolysiloxane composition which forms an elastomer at an elevated temperature comprising: (a) An organopolysiloxane having an average of at least two hydroxyl groups per molecule, (b) an organosilicon compound having an average of at least two hydrolyzable groups per molecule, said hydrolyzable groups are selected from the group consisting of acyloxy groups, aminoxy groups, amine groups, acylamine groups, oxime groups and mixtures thereof, (c) an organohydrogenpolysiloxane having an average of at least one silicon-bonded hydrogen atom per molecule, and (d) a platinum catalyst.
Claim 3
Dependent Claim
14 words
The composition of claim 1, wherein a condensation catalyst is incorporated in the composition.
Claim 4
Dependent Claim
85 words
The composition of claim 1 or 2, wherein the organosilicon compound is selected from the group consisting of a silane of the formula where R' is selected from the group consisting of a monovalent hydrocarbon radical, a substituted monovalent hydrocarbon radical, a hydrocarbonoxy radical and mixtures thereof, Z is a hydrolyzable group selected from acyloxy groups, aminoxy groups, amine groups, acylamine groups, oxime groups and mixtures thereof, and a is 0, 1 or 2 and partial hydrolyzates thereof having from 2 to 10 silicon atoms.
Claim 5
Dependent Claim
15 words
The composition of claim 1, 2 or 3, wherein the organopolysiloxane is a hydroxyl-terminated organopolysiloxane.
Claim 6
Dependent Claim
55 words
The composition of claim 4, wherein the hydroxyl-terminated organopolysiloxane is represented by the formula where R is selected from the group consisting of monovalent hydrocarbon radicals and substituted monovalent hydrocarbon radicals having from 1 to 18 carbon atoms and m is a number such that the viscosity is from 50 to 500,000 mPa.s at 25°C.
Claim 7
Dependent Claim
164 words
The composition of claim 1, wherein the organohydrogenpolysiloxane is represented by the formula where R is selected from the group consisting of a monovalent hydrocarbon radical and a substituted monovalent hydrocarbon radical, b has a value of from 0 to 2.5, c has a value of from 0.0005 to 2.0 and the sum of b + c is equal to from 1.0 to 3, or a copolymer having at least one siloxane unit of the formula where R is selected from the group consisting of a monovalent hydrocarbon radical and a substituted monovalent hydrocarbon radical, d has a value of 0, 1 or 2, e has a value of 1 or 2 and the sum of d + e is 1, 2 or 3 and the remaining siloxane units are represented by the formula where R is selected from the group consisting of a monovalent hydrocarbon radical and a substituted monovalent hydrocarbon radical and f has a value of 0, 1, 2 or 3.
Claim 8
Dependent Claim
40 words
The composition of any of the claims 1 to 6, wherein b) the organosilicon compound and/or c) the organohydrogenpolysiloxane and/or a) the organopolysiloxane having an average of at least two hydroxyl groups per molecule contain(s) at least one alkenyl group.
Claim 9
Dependent Claim
102 words
A process for preparing the composition of any of the claims 1 to 7, which comprises (1) mixing under anhydrous conditions, a hydroxyl-containing organopolysiloxane having an average of at least two hydroxyl groups per molecule with an organosilicon compound containing at least two hydrolyzable groups, in which the hydrolyzable groups are selected from the group consisting of acyloxy groups, aminoxy groups, amine groups, acylamine groups, oxime groups and mixtures thereof, (2) adding an organohydrogenpolysiloxane and platinum catalyst and, optionally, a condensation catalyst to the resultant mixture and then (3) heating the composition to a temperature ranging from 80 0 C to 220°C.
Claim 10
Dependent Claim
97 words
A two-package system which comprises one-package containing (a) an organopolysiloxane having an average of at least two hydroxyl groups per molecule, (b) an organosilicon compound having an average of at least one alkenyl group per molecule and at least two hydrolyzable groups per molecule, said hydrolyzable groups are selected from the group consisting of acyloxy groups, aminoxy groups, amine groups, acylamine groups, oxime groups and mixtures thereof, (c) a platinum catalyst and, optionally, e) a condensation catalyst, and a second package containing (d) an organohydrogenpolysiloxane having an average of at least one silicon-bonded hydrogen atom per molecule.
Claim 11
Dependent Claim
97 words
A two-package system which comprises one-package containing (a) an organopolysiloxane having an average of at least two hydroxyl groups per molecule, (b) an organosilicon compound having an average of at least one alkenyl group per molecule and at least two hydrolyzable groups per molecule, said hydrolyzable groups are selected from the group consisting of acyloxy groups, aminoxy groups, amine groups, acylamine groups, oxime groups and mixtures thereof, (c) a platinum catalyst and, optionally, e) a condensation catalyst, and a second package containing (d) an organohydrogenpolysiloxane having an average of at least one silicon-bonded hydrogen atom per molecule.
Claim 12
Dependent Claim
26 words
An organopolysiloxane elastomer which is obtained by heating the composition of any of the claims 1 to 7, to a temperature ranging from 80°C to 220°C.
References Cited (Backward Citations)
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