Polyurethane resin composition for electrical insulation

Patent metadata

Field	Value
Publication number	US-9666330-B2
Application number	US-201214349783-A
Country	US
Kind code	B2
Filing date	Sep 27, 2012
Priority date	Oct 12, 2011
Publication date	May 30, 2017
Grant date	May 30, 2017

Abstract

The invention provides a polyurethane resin composition for electrical insulation that has excellent compatibility between an isocyanate component and a polyol component, and that exhibits excellent heat resistance, moisture resistance, and insulation properties. The polyurethane resin composition for electrical insulation comprises (1) Part A comprising a polyisocyanate component obtained from at least one member selected from the group consisting of aliphatic diisocyanates and alicyclic diisocyanates, and containing one or more isocyanurate groups and one or more allophanate groups; and (2) Part B comprising a polyol component, wherein the polyisocyanate component has a molar ratio, (a)/(b), of isocyanurate groups (a) to allophanate groups (b) of 85/15 to 15/85.

First claim

The invention claimed is:

1. A polyurethane resin composition for electrical insulation comprising:
(1) Part A comprising a polyisocyanate component obtained from at least one member selected from the group consisting of aliphatic diisocyanates and alicyclic diisocyanates, and from a C 6-9 monoalcohol consisting of a saturated hydrocarbon group; and
the polyisocyanate component containing one or more isocyanurate groups and one or more allophanate groups; and
(2) Part B comprising a polyol component which comprises a polybutadiene polyol and a castor oil-based polyol,
wherein the polyisocyanate component has a molar ratio, (a)/(b), of isocyanurate groups (a) to allophanate groups (b) in the range of 85/15 to 15/85.

2. The polyurethane resin composition for electrical insulation according to claim 1 , wherein the polyisocyanate component has a molar ratio, (a)/(b), of isocyanurate groups (a) to allophanate groups (b) in the range of 75/25 to 25/75.

3. The polyurethane resin composition for electrical insulation according to claim 1 , wherein Part B comprises a plasticizer that does not have a hydroxyl group.

4. The polyurethane resin composition for electrical insulation according to claim 3 , wherein the plasticizer is at least one selected from the group consisting of phthalate esters, trimelitate-based plasticizers, and phosphoric esters.

5. The polyurethane resin composition for electrical insulation according to claim 1 , wherein the proportion of the polybutadiene polyol and the castor oil-based polyol in part B is in the range of 90:10% by weight to 50:50% by weight.

6. A sealing member comprising the polyurethane resin composition for electrical insulation of claim 1 .

7. An electrical component comprising the sealing member of claim 6 .

8. A sealing member comprising the polyurethane resin composition for electrical insulation of claim 2 .

9. An electrical component comprising the sealing member of claim 8 .

Assignees

• Sanyu Rec Co Ltd
• Asahi Kasei Chemicals Corp

Inventors

• Takei Yoshimichi
• Morisaki Akira
• Fukuchi Takashi

Classifications

• H01B3/302 Primary

  Polyurethanes or polythiourethanes; Polyurea or polythiourea · CPC title

• C08G18/7837

  containing allophanate groups · CPC title

• C08G18/6576

  Compounds of group C08G18/69 · CPC title

• C08G18/227

  of antimony, bismuth or arsenic · CPC title

• C08G18/69

  Polymers of conjugated dienes {(hydrogenated polymers of conjugated dienes C08G18/6208)} · CPC title