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Title:
ADHESIVE CONTAINING BLOCK COPOLYMER
Document Type and Number:
WIPO Patent Application WO/2014/185350
Kind Code:
A1
Abstract:
Provided are: an acrylic-based hot-melt adhesive that is superior in terms of both hot-melt coating characteristics and holding strength, is favorable for application in hot-melt coating methods that coat at a high speed at low temperatures, has superior transparency and weather resistance, and furthermore has superior adhesion at low temperatures; and a block copolymer favorable for use with respect to same. The present invention produces an adhesive containing a block copolymer having at least one structure represented by the general formula -[A1]-[B/A2]- (wherein: [A1] indicates a polymer block comprising a structural unit derived from a methacrylic ester (A1); [B/A2] indicates a copolymer block comprising a structural unit derived from an acrylic ester (B) and a structural unit derived from a methacrylic ester (A2); and the copolymer block [B/A2] has a gradient copolymer block section at which the copolymer ratio of the methacrylic ester (A2) continues to increase from the section of bonding to the copolymer block [A1]), having a total content of structural units derived from the methacrylic ester (A1) and the methacrylic ester (A2) of 5-60 mass%, having a weight average molecular weight (Mw) of 30,000-300,000, and having a molecular weight distribution (Mw/Mn) of 1.0-1.5.

Inventors:
NAKADA KANAYO (JP)
MORISHITA YOSHIHIRO (JP)
Application Number:
PCT/JP2014/062465
Publication Date:
November 20, 2014
Filing Date:
May 09, 2014
Export Citation:
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Assignee:
KURARAY CO (JP)
International Classes:
C09J153/00; C08F297/02
Domestic Patent References:
WO2012132115A12012-10-04
WO2002026847A12002-04-04
Foreign References:
JP2012503062A2012-02-02
JP2006509882A2006-03-23
JP2002533556A2002-10-08
JP2004002736A2004-01-08
JP2006117932A2006-05-11
JPH0693060A1994-04-05
JPH05507737A1993-11-04
JPH11335432A1999-12-07
US5403658A1995-04-04
Other References:
A.AYMONIER ET AL.: "Control of Structure and Tack Properties of Acrylic Pressure-Sensitive Adhesives Designed by a Polymerization Process", JOURNAL OF APPLIED POLYMER SCIENCE, vol. 89, 2003, pages 2749 - 2756, XP055293100
A.I.BUZIN ET AL.: "Calorimetric study of block- copolymers of poly(n-butyl acrylate) and gradient poly(n-butyl acrylate-co-methyl methacrylate", POLYMER, vol. 43, 2002, pages 5563 - 5569, XP004374470
C.LAUREAU ET AL.: "Effect of the Composition profile of 2-Ethyl Hexyl Acrylate/Methyl Methacrylate Latex Particles on Adhesion", JOURNAL OF APPLIED POLYMER SCIENCE, vol. 81, 2001, pages 1258 - 1265, XP055293101
JOURNAL OF POLYMER SCIENCE: PART A: POLYMER CHEMISTRY, vol. 43, 2005, pages 1100 - 1118
MACROMOLECULAR CHEMISTRY AND PHYSICS, vol. 201, 2000, pages 1108 - 1114
Attorney, Agent or Firm:
SSINPAT PATENT FIRM (JP)
Patent business corporation SSINPAT (JP)
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