REMOVABLE ADHESIVE COMPOSITION, REMOVABLE ADHESIVE LAYER, ADHESIVE SHEET, AND SURFACE PROTECTIVE MATERIAL

• Main Authors: OOYAMA, KOOKI, YAMANAKA, TAKESHI
• Format: Patent
• Language: English; French; German
• Published: 07.11.2007
• Subjects: ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; ADHESIVES; CHEMISTRY; COMPOSITIONS BASED THEREON; COMPOSITIONS OF MACROMOLECULAR COMPOUNDS; DYES; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; 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-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ORGANIC MACROMOLECULAR COMPOUNDS; PAINTS; PERFORMING OPERATIONS; POLISHES; TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION; TECHNICAL SUBJECTS COVERED BY FORMER USPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; THEIR PREPARATION OR CHEMICAL WORKING-UP; TRANSPORTING; USE OF INORGANIC OR NON-MACROMOLECULAR ORGANIC SUBSTANCES ASCOMPOUNDING INGREDIENTS; USE OF MATERIALS AS ADHESIVES

The present invention is a re-peeling pressure-sensitive adhesive composition which is used for a surface protecting material for an adherend having a photocatalytic layer, comprising: a (meth)acryl-based polymer including, as monomer units, 50 to 99.9% by weight of (A) at least one acrylate-based monomer represented by the following general formula (1) : CH 2 =CR 1 COOR 2 wherein R 1 represents a hydrogen atom or a methyl group, and R 2 represents an alkyl group having 2 to 14 carbon atoms, 0.1 to 10% by weight of (B) a functional-group-containing vinyl-based monomer, and 0 to 49.9% by weight of (C) a vinyl-based monomer copolymerizable with the component (A) and/or the component (B) ; and (D) a surfactant having a molecular weight of 150 to 5000, the amount of the component (D) being from 0.01 to 30 parts by weight with respect to 100 parts by weight of the (meth)acryl-based polymer. The use of the re-peeling pressure-sensitive adhesive composition of the invention makes it possible to provide a re-peeling pressure-sensitive adhesive composition excellent in re-peeling property and contact-angle-recoverability and suitable for a surface protecting material for an adherend having a photocatalytic layer, and further provide a re-peeling pressure-sensitive adhesive composition excellent in weather resistance besides the above-mentioned properties.