Patent EP0495307A1 successfully refreshed from Google Patents.
EP0495307A1
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EP
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Polyisocyanate curing agent and coating and adhesive cmpositions containing it
Assignee: Nippon Polyurethane Industry Co Ltd
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Filing: 1991-12-17
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Granted: —
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Expires: 2011-12-17
Abstract
Abstract A curing agent for a two-component polyurethane has as its main constituent a hexamethylene diisocyanate-derived polyisocyanate having a viscosity below 1,400 mPa.s/25°C substantially free from monomeric hexamethylene diisocyanate and from solvent, and having an uretidine dione dimer content of greater than 10% and an isocyanurate cyclic trimer content of less than 60%.
Inventors
- 👤 Mitsuhiro Yoshida
- 👤 Susumu Sarto
- 👤 Yukio Obuchi
- 👤 Shin Konishi
- 👤 Masanori Shindo
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 02:21
CPC Classifications
C; C09; C09J; C09J175/00; C09J175/04; C08; C08G; C08G18/00; C08G18/06; C08G18/70; C08G18/72; C08G18/77; C08G18/78; C08G18/79; C08G18/791; C08G18/792; C08G18/798; C09D; C09D175/00; C09D175/04
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
50 words
A curing agent for a two-component polyurethane, comprising a hexamethylene diisocyanate-derived polyisocyanate having a viscosity below 1,400 mPa.s/25°C and being substantially free from monomeric hexamethylene diisocyanate and from solvent, and having an uretidine dione dimer content of greater than 10% and an isocyanurate cyclic trimer content of less than 60%.
Claim 2
Dependent Claim
20 words
A curing agent according to claim 1, wherein the polyisocyanate has an uretidine dione dimer content of 15 to 40%.
Claim 3
Dependent Claim
23 words
A curing agent according to claim 1 or claim 2, wherein the polyisocyanate has an isocyanurate cyclic trimer content of 15 to 45%.
Claim 4
Dependent Claim
45 words
A polyurethane composition, containing a polyhydroxyl compound and a curing agent according to any one of claims 1 to 3, the molar ratio of isocyanate groups in the polyisocyanate of the curing agent to hydroxyl groups in the polyhydroxyl compound being from 9:1 to 1:9.
Claim 5
Dependent Claim
21 words
A composition according to claim 4, wherein the molar ratio of isocyanate groups to hydroxyl groups is from 6:4 to 4:6.
Claim 6
Dependent Claim
16 words
A composition according to claim 4 or claim 5, in the form of a coating composition.
Claim 7
Dependent Claim
15 words
A composition according to claim 4 or claim 5, in the form of adhesive composition.
References Cited (Backward Citations)
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