EP0199445A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Moisture-curable sealant compositions
Assignee: Bostik GmbH
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Filing: 1986-03-07
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Granted: —
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Expires: 2006-03-07
Abstract
Abstract @ The specification is concerned with sealant compositions comprising prepolymers which are capable of being cured by atmospheric moisture. The compositions provide a desirable blend of properties with regard to application and use, using prepolymers derived from comparatively inexpensive raw materials. The prepolymers correspond to a reaction product of an at least substantially linear acrylate ester polymer having a Tg of not greater than 10°C with a hydrolysable silane having a saturated organo-functional group, the reaction product being a fluid material soluble in organic solvents and curable by exposure to atmospheric moisture to a resilient solid. The prepolymer is a silane-modified polymer which preferably has from 2 to 3 hydrolysable silane groups per molecule of prepolymer and from 1 to 3 hydrolysable groups per silane group. Preferred acrylate ester polymers are homo- or co-polymers of butyl acrylate; copolymers may contain other acrylate monomers and or may contain up to 50 wt % vinyl monomer e.g. styrene. Preferred silanes are amino-silanes particularly those having 2 or 3 hydrolysable alkoxy groups. Also described and claimed are methods of making the prepolymers. The compositions are suited for construction and glazing sealants.
Inventors
- 👤 Heinz Gerhard Gilch
- 👤 Wolfgang Haar
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-26 12:46
CPC Classifications
C; C09; C09K; C09K3/00; C09K3/10; C08; C08F; C08F8/00; C08F8/42; C09J; C09J143/00; C09J143/04; C09K2003/1034; C09K2003/1056; C09K2200/00; C09K2200/04; C09K2200/0494; C09K2200/06; C09K2200/0615; C09K2200/0625
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
107 words
A flowable sealant composition comprising a fluid prepolymer material corresponding to a condensation reaction product of an at least substantially linear alkyl acrylate ester polymer having a viscosity in the range 50 to 2,000 Pas determined using an 80% solution in xylene at 23°C and a glass-transition temperature (DSC measurement method) not greater than 10°C with a hydrolysable silane having a saturated organo-functional group reactive with ester groups of the polymer, the acrylate ester polymer and silane being selected and used in quantities to provide a fluid prepolymer material which is soluble as defined and which is curable by exposure to atmospheric moisture to a resilient solid.
Claim 2
Dependent Claim
107 words
A flowable sealant composition comprising a fluid prepolymer material corresponding to a condensation reaction product of an at least substantially linear alkyl acrylate ester polymer having a viscosity in the range 50 to 2,000 Pas determined using an 80% solution in xylene at 23°C and a glass-transition temperature (DSC measurement method) not greater than 10°C with a hydrolysable silane having a saturated organo-functional group reactive with ester groups of the polymer, the acrylate ester polymer and silane being selected and used in quantities to provide a fluid prepolymer material which is soluble as defined and which is curable by exposure to atmospheric moisture to a resilient solid.
Claim 3
Dependent Claim
42 words
A composition according to claim 1, wherein the acrylate ester polymer is a homopolymer of n-butylacrylate, or a copolymer of n-butylacrylate with ethyl hexylacrylate or methylacrylate or styrene or with methylacrylate and styrene having a glass transition temperature of less than -15°C.
Claim 4
Dependent Claim
22 words
A composition according to claim 1 or 2, wherein the acrylate ester polymer comprises not less than 70% by weight butyl acrylate.
Claim 5
Dependent Claim
26 words
A composition according to any one of the preceding claims, wherein the acrylate ester polymer has a number average molecular weight (Mn) between 5,000 and 100,000.
Claim 6
Dependent Claim
21 words
A composition according to claim 4, wherein the acrylate ester polymer has a number average molecular weight between 20,000 and 40,000.
Claim 7
Dependent Claim
25 words
A composition according to claim 4 or 5, wherein the acrylate ester polymer has a weight average molecular weight in the range 100,000 to 300,000.
Claim 8
Dependent Claim
35 words
A composition according to any one of the preceding claims, wherein the acrylate ester polymer has a viscosity in the range 150 to 750 Pas as determined using an 80% solution in xylene at 23°C.
Claim 9
Dependent Claim
178 words
A composition according to any one of the preceding claims, wherein the hydrolysable silane having a saturated organo-functional group is of the general Formula II in which R 3 is a lower alkyl radical having from 1 to 5 carbon atoms, n = 0, 1 or 2, Y is a hydrolysable group for example halogen, a substituted amino group, or an organic radical bound through an oxygen, nitrogen or sulphur atom to the Si atom for example - NR 6 R 7 , -OR 6 , -SR 6 where R 6 and R 7 are the same or different namely hydrogen or an alkyl, cycloalkyl, aryl, alkaryl, or aralkyl radical, and in which when n = 0 or 1 and thus where two or more Y groups are present, the Y groups are the same or different, R 4 is a divalent hydrocarbon radical, a divalent hydrocarbon ether radical, or a divalent hydrocarbon amine radical, and in which the grouping Z is an organo-functional group which is NHR 5 and R 5 is hydrogen or an alkyl radical.
Claim 10
Dependent Claim
29 words
A composition according to any one of the preceding claims, wherein the silane is one or more of γ-amino propyl triethoxysilane, γ-amino propyl trimethoxysilane, and (-amino propyl methyl diethoxysilane.
Claim 11
Independent Claim
114 words
A method of making a prepolymer having hydrolysable silane groups attached to the prepolymer chain and suitable for use in a sealant composition according to any one of the preceding claims comprising reacting an alkyl acrylate ester polymer having a viscosity in the range 50 to 2,000 Pas determined using an 80% solution in xylene at 23°C and a glass transition temperature of less than 10°C with a hydrolysable amino-silane or hydrolysable ester silane in solution which is dried prior to addition of the amino-silane or ester silane by heating in presence of an alkoxy silane to a water content of less than 100 ppm water in presence of a catalyst and a solvent.
Claim 12
Dependent Claim
22 words
A method according to claim 10, wherein the acrylate ester polymer is as specified in any one of claims 2 to 7.
Claim 13
Dependent Claim
22 words
A method according to claim 10 or 11, wherein the silane is as specified in either one of claims 8 and 9.
Claim 14
Independent Claim
26 words
A method according to any one of claims 10 to 12, wherein the catalyst comprises dibutyl tin dilaurate, dibutyl tin diacetate, a titanate or a zirconate.
Claim 15
Independent Claim
29 words
A method according to any one of claims 10 to 12, wherein'the reaction is carried out in presence of a reaction product of dibutyl tin diacetate and tetramethyoxy silane.
Claim 16
Dependent Claim
15 words
A prepolymer made by a method according to any one of claims 10 to 14.
Claim 17
Dependent Claim
26 words
A sealant composition according to claim 1 in which the prepolymer is the product of a method according to any one of claims 10 to 14.
Claim 18
Dependent Claim
18 words
A sealant composition according to any one of claims 1 to 9 or 16, comprising a condensation catalyst.
Claim 19
Dependent Claim
25 words
A sealant composition according to any one of claims 1 to 9 or 16 or 17, comprising 0 to 90% by weight finely divided filler.
Claim 20
Dependent Claim
27 words
A sealant composition according to any one 'of claims 1 to 9 or 16 to 18, comprising 0.05 to 10% by weight of a silane adhesion promoter.
Claim 21
Dependent Claim
41 words
A sealant composition according to any one of claims 1 to 9 or 16 to 19, comprising 55 to 75% by weight prepolymer, 20 to 30 parts by weight of ester plasticiser, and 5 to 15 parts by weight fumed silica.
References Cited (Backward Citations)
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