Rigid polyurethane resin for cutting work

Patent metadata

Field	Value
Publication number	US-9580570-B2
Application number	US-201214355643-A
Country	US
Kind code	B2
Filing date	Nov 13, 2012
Priority date	Nov 30, 2011
Publication date	Feb 28, 2017
Grant date	Feb 28, 2017

Abstract

The present invention aims to provide a rigid polyurethane resin for cutting, which has high heat resistance, no scorching, and reduced expansion due to absorption of moisture in the air. The rigid polyurethane resin-forming composition (P) for cutting of the present invention includes: a polyol component (A); an isocyanate component (B); an inorganic filler (C); and a dehydrating agent (D). The polyol component (A) includes: 45 to 99% by weight of a polyphenol (j) alkylene oxide adduct (a), the polyphenol (j) having k functional groups where k is an integer of 2 or 3; and 1 to 55% by weight of a polyol (b). The polyphenol (j) alkylene oxide adduct (a) includes a total of not more than 39% by weight of a polyphenol (j) alkylene oxide adduct (ak) with at most k moles of alkylene oxide, based on 100% by weight of the polyphenol (j) alkylene oxide adduct (a), and has a hydroxyl value of 100 to 295 mg KOH/g. The polyol (b) is a multi-functional aliphatic or alicyclic polyol having 3 to 8 functional groups and has a hydroxyl value of 160 to 700 mg KOH/g. The weight of the oxyethylene groups included in the polyol component (A) is not more than 10% by weight in 100% by weight of the polyol component (A).

First claim

The invention claimed is:

1. A rigid polyurethane resin-forming composition (P) for cutting, comprising:
a polyol component (A);
an isocyanate component (B);
an inorganic filler (C); and
a dehydrating agent (D),
the polyol component (A) comprising:
55 to 99% by weight of a bisphenol A alkylene oxide adduct composition (a), and
1 to 45% by weight of a polyol (b),

wherein the bisphenol A alkylene oxide adduct composition (a) comprises a total of not more than 39% by weight of a bisphenol A alkylene oxide adduct (ak) prepared with at most 2 moles of alkylene oxide, based on 100% by weight of the bisphenol A alkylene oxide adduct composition (a), and a total of more than 61% by weight of a bisphenol A alkylene oxide adduct (ak′) prepared with more than 2 moles of alkylene oxide, based on 100% by weight of the bisphenol A alkylene oxide adduct composition (a),
wherein the bisphenol A alkylene oxide adduct composition (a) has a hydroxyl value of 100 to 295 mg KOH/g,
wherein the polyol (b) is a multi-functional aliphatic or alicyclic polyol having 3 to 8 functional groups, and has a hydroxyl value of 160 to 700 mg KOH/g, and
wherein the weight of oxyethylene groups included in the polyol component (A) is not more than 10% by weight in 100% by weight of the polyol component (A).

2. The composition (P) according to claim 1 ,
wherein each of the bisphenol A alkylene oxide adduct (ak) and the bisphenol A alkylene oxide adduct (ak′) is a bisphenol A propylene oxide adduct.

3. The composition (P) according to claim 1 ,
wherein the polyol (b) is a propylene oxide adduct of a multi-functional aliphatic or alicyclic polyol having 3 to 8 functional groups.

4. The composition (P) according to claim 1 ,
wherein the isocyanate component (B) is a C 15-63 polymethylene polyphenylene polyisocyanate.

5. The composition (P) according to claim 1 ,
wherein the inorganic filler (C) is talc.

6. The composition (P) according to claim 1 , further comprising microballoons (E), wherein the amount of the microballoons (E) is not more than 15% by weight for a total of 100% by weight of the polyol component (A) and the isocyanate component (B).

7. A rigid polyurethane resin (Q) for cutting, obtainable by a reaction of the rigid polyurethane resin-forming composition (P) for cutting according to claim 1 .

8. The polyurethane resin (Q) according to claim 7 ,
wherein the polyurethane resin (Q) is a foam.

9. A molded article (R) of the rigid polyurethane resin for cutting, comprising the rigid polyurethane resin (Q) for cutting according to claim 7 .

10. A model obtainable by cutting the molded article (R) of the rigid polyurethane resin for cutting according to claim 9 .

11. A master model obtainable by cutting the molded article (R) of the rigid polyurethane resin for cutting according to claim 9 , wherein the master model serves as a pattern for metal patterns for molding.

12. An inspection jig obtainable by cutting the molded article (R) of the rigid polyurethane resin for cutting according to claim 9 .

13. A method for producing a rigid polyurethane resin for cutting, comprising
mechanical frothing while reacting the rigid polyurethane resin-forming composition (P) for cutting according to claim 1 to produce a rigid polyurethane resin (Q) for cutting.

14. The method according to claim 13 ,
wherein the rigid polyurethane resin-forming composition (P) for cutting further comprises a foam stabilizer (F).

Assignees

• Sanyo Chemical Ind Ltd

Inventors

• Awahara Masaki
• Mori Yusaku

Classifications

• C08G18/4879 Primary

  containing aromatic groups · CPC title

• C08G18/4804

  Two or more polyethers of different physical or chemical nature · CPC title

• C08G18/7664

  containing alkylene polyphenyl groups · CPC title

• C08J9/30

  by mixing gases into liquid compositions or plastisols, e.g. frothing with air · CPC title

• C08G2101/0025

  Chemistry & Metallurgy · mapped topic