Patent EP0466409A1 successfully refreshed from Google Patents.
EP0466409A1
Expired / Lapsed
EP
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Polymer blend
Assignee: Rohm and Haas Co
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Filing: 1991-07-04
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Granted: —
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Expires: 2011-07-04
Abstract
Abstract A polymer blend useful as a binder in an aqueous coating composition containing no coalescent is provided. The polymer blend comprises from about 20 to about 60 weight percent of a hard emulsion polymer, having a glass transition temperature greater than about room temperature, and from about 80 to about 40 weight percent of a soft emulsion polymer, having a glass transition temperature less than about 20°C.
Inventors
- 👤 John Michael Friel
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-05 17:14
CPC Classifications
C; C09; C09D; C09D133/00; C09D133/02; C09D125/00; C09D125/02; C09D125/04; C09D125/08; C09D125/14; C09D133/04; C09D133/06; C08; C08L; C08L2205/00; C08L2205/02; C08L33/00; C08L33/04; C08L33/06
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
87 words
A film forming polymeric binder comprising a blend of at least one hard emulsion polymer having a glass transition temperature (T g ) greater than 20°C, preferably from 25 to 65°C, and at least one soft emulsion polymer having a T g less than 20°C, preferably from 10°C to -5°C, wherein said blend comprises from 20 to 60, preferably from 20 to 40 weight percent of said hard emulsion polymer and from 80 to 40, preferably from 80 to 60 weight percent of said soft emulsion polymer.
Claim 2
Dependent Claim
26 words
Binder according to claim 1 wherein said hard emulsion polymer is a copolymer formed from butyl acrylate, styrene, methacrylic acid, methyl methacrylate, 2-ethylhexyl acrylate and/or acrylonitrile.
Claim 3
Dependent Claim
25 words
Binder according to claim 1 or 2 wherein said soft emulsion polymer is a copolymer formed from butyl acrylate, styrene, methacrylic acid, and/or methyl methacrylate.
Claim 4
Dependent Claim
64 words
Binder according to any preceding claim wherein said soft emulsion polymer comprises 60 weight percent of the blend and has a T g of 5°C, and said hard emulsion polymer comprises 40 weight percent of the blend and has a T g of 65°C, both the soft polymer and the hard polymer being copolymers formed from butyl acrylate, styrene, methacrylic acid and/or methyl methacrylate.
Claim 5
Dependent Claim
23 words
Binder according to any preceding claim wherein the hard emulsion polymer and soft emulsion polymer are each copolymers formed from the same monomers.
Claim 6
Dependent Claim
24 words
Binder according to claim 5 wherein said hard and soft emulsion polymers each comprise a copolymer formed from butyl acrylate and methyl methacrylate monomers.
Claim 7
Dependent Claim
49 words
Binder according to any preceding claim wherein the difference between the average particle size diameter of the soft emulsion polymer and said hard emulsion polymer is maximized, preferably such that the particle size of the soft polymer is at least 300 nm greater than that of the hard polymer.
Claim 8
Dependent Claim
35 words
Binder according to claim 7 where the average particle size diameter of said soft emulsion polymer is about 530 nm and the average particle size diameter of said hard emulsion polymer is about 120 nm.
Claim 9
Dependent Claim
15 words
An aqueous coating composition containing a film forming polymeric binder according to any preceding claim.
Claim 10
Dependent Claim
13 words
An aqueous coating composition according to claim 9 free of volatile organic solvent.
References Cited (Backward Citations)
EP0064228A1
Cited
US4826907A
Cited
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