Polymer mixtures containing polydiorganosiloxane urea-containing components

US6846893B1 · kind B1 · utility

Assignee

• Minnesota Mining and Manufacturing Company · US

Inventors

• Audrey A. Sherman · Windom, US
• Mieczyslaw H. Mazurek · Roseville, US
• Walter R. Romanko · Woodbury, US
• Patrick D. Hyde · Mendota Heights, US
• Roy Wong · White Bear Lake, US
• Albert I. Everaerts · Tucson, US

Key dates

• Filing date: Oct 23, 1996
• Grant date: Jan 25, 2005
• Expiry date: Dec 7, 2016

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08L2666/04
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

A mixture is provided comprising (a) at least one of an elastomeric thermoplastic, a non-elastomeric thermoplastic, an elastomeric thermoset and mixtures thereof, excluding polydiorganosiloxane fluids and (b) a polymer having soft polydiorganosiloxane units, hard polyisocyanate residue units, optionally, soft and/or hard organic polyamine residue units and terminal groups. The hard polyisocyanate residue and the hard polyamine residue comprise less than 50% by weight of the polydiorganosiloxane urea containing component. The polyisocyanate residue is the polyisocyanate minus the —NCO groups and the polyamine residue is the polyamine minus the —NH2 groups. The polyisocyanate residue is connected to the polyamine residue by urea linkages. The terminal groups are non-functional groups or functional groups. The polydiorganosiloxane urea containing component may be reactive under free-radical or moisture curing conditions. The mixture may also optionally contain tackifying materials, free radical initiators, crosslinking agents, cure catalysts, and nonreactive additives such as fillers, pigments, stabilizers, antioxidants, flame retardants, plasticizers, compatibilizers and the like.