EP0409301A2
Expired / Lapsed
EP
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Acid etch resistant coatings
Assignee: Akzo Nobel NV
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Filing: 1990-06-27
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Granted: —
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Expires: 2010-06-27
Abstract
Abstract A high solids coating composition suitable for use, for example, as a high performance automotive coating is provided, which comprises (1) a particular polyurethane polyol which is the reaction product of an asymmetric diol component and an isocyanate component, and (2) an hydroxyl groups-reactive crosslinking agent. When formulated as a one-pack coating preferably with an aminoplast crosslinking agent, these coating compositions possess a number of desirable properties including excellent acid etch resistance.
Inventors
- 👤 John L. Gardon
- 👤 Peter W. Uhlianuk
- 👤 Scott W. Loper
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-29 07:19
CPC Classifications
G; G01; G01F; G01F1/00; G01F1/68; G01F1/684; G01F1/688; G01F1/69; G01F1/692; C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/30; C08G18/32; C07; C07C; C07C271/00; C07C271/06; C07C271/08; C07C271/24; C08G18/3203; C08G18/3206; C08G18/38; C08G18/3819; C08G18/3823; C08G18/3831; C08G18/40; C08G18/64; C08G18/6415; C08G18/70; C08G18/72; C08G18/77; C08G18/78; C08G18/7806; C08G18/7818; C08G18/7831; C08G18/79; C08G18/791; C08G18/792; C08G18/80; C08G18/8003; C08G18/8006; C08G18/8009; C08G18/8035; C09; C09D; C09D175/00; C09D175/04
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
104 words
A coating composition comprising (1) a polyol and (2) an hydroxyl group-reactive crosslinking agent, charaterized in that the polyol comprises: (1) a polyurethane polyol possessing a number average molecular weight in the range of from about 600 to about 3000 and a degree of dispersion in the range of from about 1,1 to about 3,5, comprising the reaction product of (A) a diol component selected from substantially monomeric, assymmetric diols wherein the hydroxyl groups are separated by 3 carbon atoms or less, and (B) an isocyanate component selected from n-functional polyisocyanates, wherein n is a number in the range of from 2 to 5.
Claim 2
Dependent Claim
104 words
A coating composition comprising (1) a polyol and (2) an hydroxyl group-reactive crosslinking agent, charaterized in that the polyol comprises: (1) a polyurethane polyol possessing a number average molecular weight in the range of from about 600 to about 3000 and a degree of dispersion in the range of from about 1,1 to about 3,5, comprising the reaction product of (A) a diol component selected from substantially monomeric, assymmetric diols wherein the hydroxyl groups are separated by 3 carbon atoms or less, and (B) an isocyanate component selected from n-functional polyisocyanates, wherein n is a number in the range of from 2 to 5.
Claim 3
Dependent Claim
39 words
The coating composition according to claim 1, characterized in that it possesses a non-volatiles content ranging from about 40 wt% to about 80 wt% at a solution viscosity ranging from about 25 cps to about 300 cps at 20°C.
Claim 4
Dependent Claim
39 words
The coating composition according to claim 2, characterized in that it possesses a non-volatiles content ranging from about 40 wt% to about 80 wt% at a solution viscosity ranging from about 50 cps to about 200 cps at 20°C.
Claim 5
Dependent Claim
36 words
The coating composition according to claim 1, characterized in that the polyurethane polyol comprises the reaction product of (A) from 0,8n to 1,2n moles of the diol component and (B) 1 mole of the isocyanate component.
Claim 6
Dependent Claim
36 words
The coating composition according to claim 4, characterized in that the polyurethane polyol comprises the reaction product of (A) from 0,9n to 1,1n moles of the polyol component, and (B) 1 mole of the isocyanate component.
Claim 7
Dependent Claim
36 words
The coating composition according to claim 5, characterized in that the polyurethane polyol comprises the reaction product of (A) from 0,95n to 1,05n moles of the polyol component, and (B) 1 mole of the isocyanate component.
Claim 8
Dependent Claim
36 words
The coating composition according to claim 6, characterized in that the polyurethane polyol comprises the reaction product of (A) from 0,98n to 1,02n moles of the polyol component, and (B) 1 mole of the isocyanate component.
Claim 9
Dependent Claim
22 words
The coating composition according to claim 1, characterized in that n is a number in the range of from 2 to 4.
Claim 10
Dependent Claim
22 words
The coating composition according to claim 8, characterized in that n is a number in the range of from 3 to 4.
Claim 11
Dependent Claim
64 words
The coating composition according to claim 9, characterized in that the polyisocyanate component of the polyurethane polyol is selected from an isocyanurate of a monomeric diisocyanate, a biuret of a monomeric diisocyanate, and the reaction product of a monomeric diisocyanate with a multi-functional alcohol having 2 to 4 hydroxyl groups in a ratio of hydroxyl to isocyanate groups of from about 0,45 to 0,55.
Claim 12
Dependent Claim
32 words
The coating composition according to claim 1, characterized in that the diol component of the polyurethane polyol is selected from substantially monomeric asymmetric diols having a primary and a secondary hydroxyl group.
Claim 13
Dependent Claim
35 words
The coating composition according to claim 11, characterized in that the diol component of the polyurethane polyol is selected from 2-ethyl-1,3-hexane diol, 1,2-propane diol, 1,3-butane diol, 1,2-hexane diol, 1,2-octane diol, 1,2-decane diol and 2,2,4-trimethyl-1,3-pentane diol.
Claim 14
Dependent Claim
31 words
The coating composition according to claim 12, characterized in that the polyol component of the polyurethane polyol is selected from 2-ethyl-1,3-hexane diol, 1,2-hexane diol, 1,2-octane diol, 1,2-decane diol and 2,2,4-trimethyl-1,3-pentane diol.
Claim 15
Dependent Claim
24 words
The coating composition according to claim 1, characterized in that the polyurethane polyol possesses a number average molecular weight of about 2500 or less.
Claim 16
Dependent Claim
23 words
The coating composition according to claim 1, characterized in that the polyurethane polyol possesses a number average molecular weight greater than about 1000.
Claim 17
Dependent Claim
23 words
The coating composition according to claim 1, characterized in that the polyurethane polyol possesses a degree of dispersion of about 2,5 or less.
Claim 18
Dependent Claim
23 words
The coating composition according to claim 16, characterized in that the polyurethane polyol possesses a degree of dispersion of about 2,0 or less.
Claim 19
Dependent Claim
26 words
The coating composition according to claim 1, characterized in that the hydroxyl group-reactive crosslinking agent is selected from a polyisocyanate, blocked polyisocyanate and an aminoplast resin.
Claim 20
Dependent Claim
19 words
The coating composition according to claim 18, characterized in that the hydroxyl group-reactive crosslinking agent comprises an aminoplast resin.
Claim 21
Dependent Claim
38 words
The coating composition according to claim 19, characterized in that the hydroxyl group-reactive crosslinking agent comprises an aminoplast resin in a weight ratio of polyurethane polyol to aminoplast resin in the range of from about 90/10 to 50/50.
Claim 22
Dependent Claim
28 words
The coating composition according to claim 20, characterized in that the aminoplast resin comprises an hexamethoxy melamine etherified with an alcohol having from 1 to 4 carbon atoms.
Claim 23
Dependent Claim
14 words
The coating composition according to any of claims 1-21, formulated as a one-pack system.
References Cited (Backward Citations)
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