EP0449359A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Elastomer modified epoxy resin for powder coating compositions
Assignee: Shell Internationale Research Maatschappij BV
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Filing: 1991-03-20
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Granted: —
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Expires: 2011-03-20
Abstract
Abstract A method for dispersing and stabilizing a carboxy-functionalized block copolymer in an epoxy resin is provided comprising the steps of: (a) dispersing from 5 to 30 weight percent of a carboxy-functionalized hydrogenated diolefin-monoalkenylarene block copolymer in a liquid epoxy resin to produce an elastomer-dispersed epoxy resin composition; (b) contacting the elastomer-dispersed epoxy resin composition and from 15 to 30 weight percent, based on the weight of the elastomer-modified epoxy resin composition, of a polyhydric phenolic compound in the presence of an advancement catalyst at a temperature within the range of from 40 °C to 200 °C for time effective for producing a solid elastomer-modified epoxy resin having an epoxy equivalent weight in the range of from 500 to 1,500; and (c) recovering said solid elastomer-modified epoxy resin.
Inventors
- 👤 Edward John Marx
- 👤 Michael James Watkins
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-03 14:28
CPC Classifications
C; C08; C08L; C08L63/00; C08G; C08G59/00; C08G59/02; C08G59/04; C08G59/06; C08G59/066; C09; C09D; C09D163/00; Y; Y10; Y10S; Y10S525/00; Y10S525/934
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
127 words
A process for preparing an elastomer-modified epoxy resin composition comprising the steps of: (a) dispersing from 5 to 30 weight percent based on unmodified epoxy resin of a carboxy-functionalized hydrogenated conjugated diolefin/monoalkenylarene block copolymer in a liquid epoxy resin to produce an elastomer-dispersed epoxy resin composition; (b) contacting the elastomer-dispersed epoxy resin composition and from 15 to 30 weight percent, based on the weight of the final elastomer-modified epoxy resin composition, of a polyhydric phenolic compound in the presence of an advancement catalyst at a temperature within the range of from 40 °C to 200 °C for time effective for producing a solid elastomer-modified epoxy resin having an epoxy equivalent weight in the range of from 500 to 1,500; and (c) recovering said solid elastomer-modified epoxy resin.
Claim 2
Dependent Claim
17 words
The process of claim 1 wherein the epoxy resin is a glycidyl ether of a dihydric phenol.
Claim 3
Dependent Claim
79 words
The process of claim 1 or 2 wherein the carboxy-functionalized hydrogenated conjugated diolefin/monoalkenylarene block copolymer comprises a carboxylated base block copolymer of the formula: A z -(B-A) y -B x wherein A is a linear or branched polymeric block comprising predominantly monoalkenyl aromatic hydrocarbon monomer units; B is a linear or branched polymeric block containing predominantly conjugated diolefin monomer units; x and z are, independently, 0 or 1; and y is a whole number ranging from 1 to 20.
Claim 4
Dependent Claim
274 words
The process of claim 1 or 2 wherein the carboxy-functionalized hydrogenated conjugated diolefin/monoalkenylarene block copolymer comprises a carboxylated base block copolymer of the formula: [B x -(A-B) y -A] n -C-P n ' wherein A is a linear or branched polymeric block comprising predominantly monoalkenyl aromatic hydrocarbon monomer units; B is a linear or branched polymeric block containing predominantly conjugated diolefin monomer units; x and z are, independently, 0 or 1; y is a whole number ranging from 1 to 20; n and n' are numbers from 0 to 100 and n + n' ≧ 3; C is the core of a coupled or radial polymer formed with a polyfunctional coupling agent; and each P is the same or a different polymer block or polymer segment having the general formula: B' x' -(A'-B'') y' -A'' z ' wherein A'' is a polymer block containing predominantly monoalkenyl aromatic hydrocarbon monomer units which may be the same or different from A; B' is a polymer block containing predominantly conjugated diolefin monomer units which may be the same or different from B; A' -B'' is a polymer block containing monoalkenyl aromatic hydrocarbon monomer units A' and conjugated diolefin monomer units B'', the A'-B'' monomer units may be random, tapered or block and when each of A' and B'' is block, the A' block may be the same or different from A'' and B'' may be the same or different from B'; x' and z' are, independently, numbers equal to 0 or 1; and y' is a number from 0 to 20, and the sum of x' plus y' plus z' is greater than or equal to 1.
Claim 5
Dependent Claim
20 words
A coating composition comprising a composition obtainable with a process as claimed in any one of claims 1 to 4.
References Cited (Backward Citations)
No citation records indexed.
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