EP0342042A2
Expired / Lapsed
EP
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Water-borne coating composition
Assignee: Nippon Paint Co Ltd
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Filing: 1989-05-11
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Granted: —
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Expires: 2009-05-11
Abstract
Abstract An aqueous composition comprising an aqueous or water-insoluble resin, and, dispersed in the composition, a graft polymer having a total molecular weight of 5000 to 100,000 and comprising a branch chain with a molecular weight of 1000 to 4000 and a principal chain, wherein one of the branch chain and the principal chain is hydrophobic and has a solubility parameter of 8.0 to 115, and the other is hydrophilic and has a solubility parameter of 10.0 to 13.0, provided that there is a difference between the solubility parameters of at least 1, wherein an aqueous dispersion of the graft polymer has an integrating sphere turbidity of 50 degrees (kaoline) at a concentration of 10 to 70% by weight and a viscosity of 50 to 10,000 cps. There is a difference between the solubility parameters of the aqueous or water-insoluble resin and of a portion of the graft polymer of not more than 2.
Inventors
- 👤 Hideyoshi Noda
- 👤 Teruaki Kuwajima
- 👤 Motoyoshi Yoshikawa
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-29 15:05
CPC Classifications
C; C09; C09D; C09D151/00; C09D151/04
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
152 words
An aqueous composition comprising an aqueous resin, and, dispersed in the composition, a graft polymer having a total molecular weight of 5000 to 100,000 and comprising a branch chain with a molecular weight of 1000 to 4000 and a principal chain, wherein one of the branch chain and the principal chain is hydrophobic and has a solubility parameter of 8.0 to 115, and the other is hydrophilic and has a solubility parameter of 10.0 to 13.0, provided that there is a difference between the solubility parameters of at least 1, wherein an aqueous dispersion of the graft polymer has an integrating sphere turbidity of 50 degrees (kaoline) at a concentration of 10 to 70% by weight and a viscosity of 50 to 10,000 cps, and wherein there is a difference between the solubility parameters of the aqueous resin and of the hydrophilic portion of the graft polymer of not more than 2.
Claim 2
Dependent Claim
152 words
An aqueous composition comprising an aqueous resin, and, dispersed in the composition, a graft polymer having a total molecular weight of 5000 to 100,000 and comprising a branch chain with a molecular weight of 1000 to 4000 and a principal chain, wherein one of the branch chain and the principal chain is hydrophobic and has a solubility parameter of 8.0 to 115, and the other is hydrophilic and has a solubility parameter of 10.0 to 13.0, provided that there is a difference between the solubility parameters of at least 1, wherein an aqueous dispersion of the graft polymer has an integrating sphere turbidity of 50 degrees (kaoline) at a concentration of 10 to 70% by weight and a viscosity of 50 to 10,000 cps, and wherein there is a difference between the solubility parameters of the aqueous resin and of the hydrophilic portion of the graft polymer of not more than 2.
Claim 3
Dependent Claim
26 words
A composition according to claim 1, wherein the aqueous resin exhibits a surface tension of not more than 51 dyne/cm, as a 1% wt aqueous solution.
Claim 4
Dependent Claim
60 words
A composition according to claim 1 or claim 2, wherein the aqueous resin has a water-tolerance of at least 4, determined as the dilution factor of water introduced into a 100 ml beaker containing a water-borne varnish of the aqueous resin having a solids content of 5 g until a No. 1 type letter cannot be read through the beaker.
Claim 5
Dependent Claim
23 words
A composition according to any preceding claim, wherein the weight ratio of the aqueous resin to the graft polymer is 98:2 to 30:70.
Claim 6
Dependent Claim
56 words
An aqueous composition comprising a water-insoluble resin having an acid value of not more than 15, and, dispersed in the composition, a graft polymer as defined in claim 1, wherein there is a difference between the solubility parameters of the water-insoluble resin and of the hydrophobic portion of the graft polymer of not more than 2.
Claim 7
Dependent Claim
20 words
A composition according to claim 5, wherein the water-insoluble resin has a number average molecular weight of 3,000 to 10,000.
Claim 8
Dependent Claim
30 words
A composition according to claim 5 or claim 6, which comprises 5 to 100 parts by weight of the water-insoluble resin per 100 parts by weight of the graft polymer.
Claim 9
Dependent Claim
55 words
An aqueous composition comprising a water-insoluble resin having an acid value of 15 to 100, and, dispersed in the composition, a graft polymer as defined in claim 1, wherein there is a difference between the solubility parameters of the water-insoluble resin and of the hydrophilic portion of the graft polymer of not more than 2.
Claim 10
Dependent Claim
27 words
A composition according to claim 8, which comprises 2 to 150 parts by weight of the water-insoluble resin per 100 parts by weight of the graft polymer.
Claim 11
Dependent Claim
19 words
A composition according to any of claims 5 to 9, further comprising an amino resin as a curing agent.
References Cited (Backward Citations)
No citation records indexed.
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