Screen-printable acrylate pressure-sensitive adhesive composition

US5141989A · kind A · utility

Assignee

• Minnesota Mining and Manufacturing Company · US

Inventors

• Dieter Jung · Daaden, DE
• Katharina J. Bischof nee Mitrowsky · Düsseldorf, DE
• Kai Grimmel · Hilden, DE
• Robert R. L. Smolders · Antwerpen, BE

Key dates

• Filing date: Dec 7, 1990
• Grant date: Aug 25, 1992
• Expiry date: Dec 7, 2010

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/2891
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

Screen-printable acrylate pressure-sensitive adhesive composition suitable for adhesive products having simultaneously, and independently from temperature, high values of adhesion, peel strength and shear strength as well as a high water and humidity resistance, comprising PA0 (A) about 25 to 225 parts by weight of at least one dissolved inherently tacky pressure-sensitive adhesive selected from non-crosslinked (meth)acrylic ester/(meth)acrylic acid copolymers having an average molecular weight corresponding to an inherent viscosity of not more than 1.0 dl/g; and PA0 (B) 100 parts by weight of an organic solvent or solvent mixture having a low partial vapor pressure of less than about 3 kPa (30 mbar) at 20.degree. C. and a dipole amount of at least 1.0 Debye. The acrylate copolymer preferably has structural units of the formula ##STR1## wherein R.sup.1 and R.sup.2 independently are hydrogen or lower alkyl having 1 to 4 carbon atoms; R.sup.3 is hydrogen, a lower alkyl group having 1 to 4 carbon atoms and a cyano group; and R.sup.4 is hydrogen or an alkyl group having 1 to 14 carbon atoms, n is the average degree of polymerization, subject to R.sup.4 being a hydrogen atom in at least…