EP0409272A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Reaction products as adhesion additives for UV curable compositions and compositions containing same
Assignee: Dow Silicones Corp
•
Filing: 1990-07-20
•
Granted: —
•
Expires: 2010-07-20
Abstract
Abstract An adhesion additive for use with ultraviolet radiation curable siloxane compositions is the reaction product of an alkoxysilicon compound, a hydroxyl endblocked poly(diorganosiloxane) and a catalyst for the reaction between silicon-bonded alkoxy and silanol groups. Alkoxy silicon compounds can be those of the formula (RO)₃Si-X-Si(OR)₃ wherein X can be ethylene and -OR is an alkoxy group. Ultraviolet radiation curable siloxane compositions with improved adhesion are obtained by mixing the adhesion additive with a mixture which has at least one ultraviolet radiation activatable siloxane polymer and a photoinitiator. These compositions can be used as optical fiber coatings, conformal coatings and other coating applications where adhesion to a substrate is important.
Inventors
- 👤 Michael Andrew Lutz
- 👤 Kirsten Andrea Scheibert
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 07:18
CPC Classifications
C; C09; C09D; C09D183/00; C09D183/04; C08; C08L; C08L83/00; C08L83/02; C08G; C08G77/00; C08G77/04; C08G77/14; C08G77/18; C08G77/48; C08G77/50; C09J; C09J183/00; C09J183/04; C08L2666/00; C08L2666/28
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
218 words
As an adhesion additive for ultraviolet radiation curable siloxane compositions, a reaction product consisting essentially of the material obtained by combining and reacting (A) an alkoxysilicon compound selected from the group consisting of alkylpolysilicate where the alkyl groups are methyl or ethyl and a compound having a general formula (RO)₃Si-X-Si(OR)₃ in which R is methyl or ethyl and X is a divalent radical selected from the group consisting of -(CH₂) n - where n has a value of from 1 to 10 inclusive and where each R′ is independently selected from a group consisting of RO-, an aliphatic hydrocarbon radical and an aromatic hydrocarbon radical and Y is a divalent radical of the formula -(CH₂) n - where n has a value of from 1 to 10 inclusive and (B) a polydiorganosiloxane of the formula HO(R˝₂SiO) x H where R˝ is a monovalent radical independently selected from the group consisting of an aliphatic hydrocarbon radical and aromatic hydrocarbon radical and x has an average value of from 5 to 50, (C) a catalyst for reaction between a ≡SiOR group of (A) and a hydroxyl group of (B), where the amounts of (A) and (B) are such that the molar ratio of moles of alkoxy in (A) per mole of hydroxy group in (B) is from 2 to 15.
Claim 2
Dependent Claim
218 words
As an adhesion additive for ultraviolet radiation curable siloxane compositions, a reaction product consisting essentially of the material obtained by combining and reacting (A) an alkoxysilicon compound selected from the group consisting of alkylpolysilicate where the alkyl groups are methyl or ethyl and a compound having a general formula (RO)₃Si-X-Si(OR)₃ in which R is methyl or ethyl and X is a divalent radical selected from the group consisting of -(CH₂) n - where n has a value of from 1 to 10 inclusive and where each R′ is independently selected from a group consisting of RO-, an aliphatic hydrocarbon radical and an aromatic hydrocarbon radical and Y is a divalent radical of the formula -(CH₂) n - where n has a value of from 1 to 10 inclusive and (B) a polydiorganosiloxane of the formula HO(R˝₂SiO) x H where R˝ is a monovalent radical independently selected from the group consisting of an aliphatic hydrocarbon radical and aromatic hydrocarbon radical and x has an average value of from 5 to 50, (C) a catalyst for reaction between a ≡SiOR group of (A) and a hydroxyl group of (B), where the amounts of (A) and (B) are such that the molar ratio of moles of alkoxy in (A) per mole of hydroxy group in (B) is from 2 to 15.
Claim 3
Dependent Claim
18 words
The adhesion additive according to claim 1 in which (A) is the alkoxysilicon compound of the formula (RO)₃Si-X-Si(OR)₃.
Claim 4
Dependent Claim
11 words
The adhesion additive according to claim 2 in which X is
Claim 5
Dependent Claim
262 words
An ultraviolet radiation curable siloxane composition comprising (I) a mixture comprising at least one ultraviolet radiation activatable siloxane polymer which will cure when exposed to ultraviolet radiation by forming a crosslinked product and a photoinitiator which is activated by ultraviolet radiation, and (II) an adhesion additive for ultraviolet radiation curable siloxane compositions which is a reaction product consisting essentially of the material obtained by combining and reacting (A) an alkoxysilicon compound selected from the group consisting of alkylpolysilicate where the alkyl groups are methyl or ethyl and a compound having a general formula (RO)₃Si-X-Si(OR)₃ in which R is methyl or ethyl and X is a divalent radical selected from the group consisting of -(CH₂) n - where n has a value of from 1 to 10 inclusive and where each R′ is independently selected from a group consisting of RO-, an aliphatic hydrocarbon radical and an aromatic hydrocarbon radical and Y is a divalent radical of the formula -(CH₂) n - where n has a value of from 1 to 10 inclusive and (B) a polydiorganosiloxane of the formula HO(R˝₂SiO) x H where R˝ is a monovalent radical independently selected from the group consisting of an aliphatic hydrocarbon radical and aromatic hydrocarbon radical and x has an average value of from 5 to 50, (C) a catalyst for reaction between a ≡SiOR group of (A) and a hydroxyl group of (B), where the amounts of (A) and (B) are such that the molar ratio of moles of alkoxy in (A) per mole of hydroxy group in (B) is from 2 to 15.
Claim 6
Dependent Claim
262 words
An ultraviolet radiation curable siloxane composition comprising (I) a mixture comprising at least one ultraviolet radiation activatable siloxane polymer which will cure when exposed to ultraviolet radiation by forming a crosslinked product and a photoinitiator which is activated by ultraviolet radiation, and (II) an adhesion additive for ultraviolet radiation curable siloxane compositions which is a reaction product consisting essentially of the material obtained by combining and reacting (A) an alkoxysilicon compound selected from the group consisting of alkylpolysilicate where the alkyl groups are methyl or ethyl and a compound having a general formula (RO)₃Si-X-Si(OR)₃ in which R is methyl or ethyl and X is a divalent radical selected from the group consisting of -(CH₂) n - where n has a value of from 1 to 10 inclusive and where each R′ is independently selected from a group consisting of RO-, an aliphatic hydrocarbon radical and an aromatic hydrocarbon radical and Y is a divalent radical of the formula -(CH₂) n - where n has a value of from 1 to 10 inclusive and (B) a polydiorganosiloxane of the formula HO(R˝₂SiO) x H where R˝ is a monovalent radical independently selected from the group consisting of an aliphatic hydrocarbon radical and aromatic hydrocarbon radical and x has an average value of from 5 to 50, (C) a catalyst for reaction between a ≡SiOR group of (A) and a hydroxyl group of (B), where the amounts of (A) and (B) are such that the molar ratio of moles of alkoxy in (A) per mole of hydroxy group in (B) is from 2 to 15.
Claim 7
Dependent Claim
21 words
The ultraviolet radiation curable siloxane composition according to claim 4 in which (A) is (B) is poly(dimethylsiloxane) and (C) is tetrabutyltitanate.
Claim 8
Dependent Claim
34 words
The ultraviolet radiation curable siloxane composition according to claim 4 in which adhesion additive (II) is present in an amount of from 1 to 15 weight percent based on the weight of mixture (I).
References Cited (Backward Citations)
US2814601A
Cited
US4064027A
Cited
US4364809A
Cited
EP0029929A1
Cited
US4455205A
Cited
US4780486A
Cited
EP0173303A2
Cited
EP0207319A2
Cited
US4824875A
Cited
US4906695A
Cited
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.