ADHESIVE COMPOSITION, ADHESIVE LAYER, ADHESIVE SHEET AND OPTICAL FILM

• Main Authors: SHIGETOMI KIYOE, OKAMOTO MASAYUKI, SUGANO AKIRA, YAMAGATA MASATO
• Format: Patent
• Language: English
• Published: 13.03.2014
• Subjects: ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; ADHESIVES; CHEMISTRY; DEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH ISMODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THEDEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY,COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g.SWITCHING, GATING, MODULATING OR DEMODULATING; DYES; FREQUENCY-CHANGING; LAYERED PRODUCTS; LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT ORNON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM; METALLURGY; MISCELLANEOUS APPLICATIONS OF MATERIALS; MISCELLANEOUS COMPOSITIONS; NATURAL RESINS; NON-LINEAR OPTICS; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; OPTICAL ANALOGUE/DIGITAL CONVERTERS; OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS; OPTICAL LOGIC ELEMENTS; OPTICS; PAINTS; PERFORMING OPERATIONS; PHYSICS; POLISHES; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF; TRANSPORTING; USE OF MATERIALS AS ADHESIVES

PROBLEM TO BE SOLVED: To provide an adhesive having low adhesive force in an early stage of pasting that allows reworking and enough force to firmly adhere to an adherend afterward, and having excellent transparency.SOLUTION: An adhesive composition is provided, comprising 100 parts by mass of a polymer (A) having a glass transition temperature of lower than 0°C, and 0.05 to 20 parts by mass of a (meth)acrylic polymer (B) having a weight average molecular weight of 1000 or more and less than 30000 and containing a (meth)acrylic monomer having an alicyclic structure expressed by general formula (1):CH=C(R)COORand a monomer having a polyoxyalkylene skeleton as monomer units. In formula (1), Rrepresents a hydrogen atom or a methyl group; and Rrepresents an alicyclic hydrocarbon group having an alicyclic structure.