Moisture-curable polyurethane hot-melt resin composition, adhesive, and article

• US 9,670,391 B2
• Filed: 10/11/2012
• Issued: 06/06/2017
• Est. Priority Date: 10/24/2011
• Status: Active Grant

• Current Assignee: DIC Corporation
• Original Assignee: DIC Corporation
• Inventors: Nonaka, Ryou, Kanagawa, Yoshinori, Fujiwara, Toyokuni
• Primary Examiner(s): Tran, Thao T
• Application Number:
  US14/352,017
• Publication Number:
  US 20140242396A1
• Time in Patent Office: 1,699 Days
• Field of Search: 4284231, 52544007
• CPC Class Codes: C08G 18/12 using two or more compounds having active hydrogen in the first polymerisation step
• CPC Class Codes: C08G 18/307 Atmospheric humidity
• CPC Class Codes: C08G 18/4018 Mixtures of compounds of group C08G18/42 with compounds of group C08G18/48
• CPC Class Codes: C08G 18/4063 Mixtures of compounds of group C08G18/62 with other macromolecular compounds
• CPC Class Codes: C08G 18/4202 Two or more polyesters of different physical or chemical nature C08G18/44 takes precedence
• CPC Class Codes: C08G 18/4238 derived from dicarboxylic acids and dialcohols
• CPC Class Codes: C08G 18/4255 derived from polyols containing oxyalkylated carbocyclic groups and polycarboxylic acids
• CPC Class Codes: C08G 18/4808 Mixtures of two or more polyetherdiols
• CPC Class Codes: C08G 18/4825 Polyethers containing two hydroxy groups C08G18/4833 - C08G18/5096 take precedence
• CPC Class Codes: C08G 18/6229 Polymers of hydroxy groups containing esters of acrylic or methacrylic acid with aliphatic polyalcohols
• CPC Class Codes: C08G 18/7671 containing only one alkylene bisphenyl group
• CPC Class Codes: C08G 2170/20 Compositions for hot melt adhesives
• CPC Class Codes: C09J 175/04 Polyurethanes
• CPC Class Codes: C09J 175/06 from polyesters
• CPC Class Codes: Y10T 428/31551 Of polyamidoester [polyurethane, polyisocyanate, polycarbamate, etc.]

Abstract

It is an object of the present invention to provide a moisture-curable polyurethane hot-melt resin composition having excellent waterproof properties, drop impact resistance, and flexibility. The present invention provides a moisture-curable polyurethane hot-melt resin composition containing a urethane prepolymer having an isocyanate group, the urethane prepolymer being produced through a reaction of a polyol (A) with a polyisocyanate (B), wherein the polyol (A) contains a polyether polyol (A-1), a crystalline polyester polyol (A-2), an amorphous polyester polyol (A-3), and an acrylic polyol (A-4). The present invention also provides an adhesive containing such a composition and an article in which such a composition is used.

Claims

1. A moisture-curable polyurethane hot-melt resin composition comprising a urethane prepolymer having an isocyanate group, the urethane prepolymer being a reaction product of a polyol (A) and a polyisocyanate (B) only, wherein the polyol (A) contains a polypropylene glycol and/or polytetramethylene glycol (A-1), a crystalline polyester polyol (A-2), an amorphous polyester polyol (A-3), and an acrylic polyol (A-4), wherein:

the amorphous polyester polyol (A-3) is produced through a reaction of an alkylene oxide adduct of bisphenol A with a polybasic acid, and

a glass transition temperature of the amorphous polyester polyol (A-3) is in a range of −

70°

C. to −

10°

C.,

wherein the polyester polyol (A-2) is 20 to 400 parts by mass, the amorphous polyester polyol (A-3) is 10 to 300 parts by mass and the acrylic polyol (A-4) is 20 to 400 parts by mass relative to 100 parts by mass of the propylene glycol and/or polytetramethylene glycol (A-1).

2. The moisture-curable polyurethane hot-melt resin composition according to claim 1, wherein the number average molecular weight of the acrylic polyol (A-4) is in the range of 5,000 to 50,000.

3. The moisture-curable polyurethane hot-melt resin composition according to claim 1, wherein the glass transition temperature of the acrylic polyol (A-4) is in the range of 30 to 120°

C.

4. The moisture-curable polyurethane hot-melt resin composition according to claim 1, wherein the acrylic polyol (A-4) is produced through polymerization of a (meth)acrylic compound having a hydroxyl group with a (meth)alkyl acrylate.

5. The moisture-curable polyurethane hot-melt resin composition according to claim 1, wherein the amount of the acrylic polyol (A-4) is in the range of 40 to 280 parts by mass relative to 100 parts by mass of the polyether polyol (A-1).

6. The moisture-curable polyurethane hot-melt resin composition according to claim 1, wherein the amount of the amorphous polyester polyol (A-3) is in the range of 20 to 250 parts by mass relative to 100 parts by mass of the polyether polyol (A-1).

7. An adhesive comprising the moisture-curable polyurethane hot-melt resin composition according to claim 1.

8. An article comprising at least two materials attached to each other with the adhesive according to claim 7.