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1. (WO2001038448) WATER-BASED COATING COMPOSITION

Pub. No.:    WO/2001/038448    International Application No.:    PCT/US2000/011049
Publication Date: Fri Jun 01 01:59:59 CEST 2001 International Filing Date: Wed Apr 26 01:59:59 CEST 2000
IPC: C08F 265/04
C08F 265/06
C08L 51/00
C09D 151/00
Applicants: 3M INNOVATIVE PROPERTIES COMPANY
Inventors: KAUSCH, William, L.
Title: WATER-BASED COATING COMPOSITION
Abstract:
This invention provides a new water-based composition suitable for use on polyester-based substrates for increasing adhesion to overcoat. The composition has: (a) from about 1 to 8 percent solids by weight of core-shell latex polymer wherein the core has a lower Tg than the shell, the latex comprising: (1) the core formed from (i) about 60 to 95 parts by weight of at least one α,β-ethylenically unsaturated monomer having from about 1 to 12 carbon atoms; (ii) 0 to about 35 parts by weight of bicyclic alkyl methacrylates; and (iii) at least 5 parts by weight of a polar monomer, based on a total weight of the core; and (2) the shell formed from (i) about 35 to 95 parts by weight of at least one α,β-ethylenically unsaturated monomer having from about 1 to about 12 carbon atoms; (ii) 0 to about 60 parts by weight of at least one monomer selected from the group consisting of bicyclic alkyl methacrylates and aromatic methacrylates; and (iii) at least 5 parts by weight of a polar monomer, based on the total weight of the shell; (b) from about 4 to 16 percent solids by weight of a water-soluble polymer selected from the group consisting of acrylate-based resin, sulfonated polyester-based resin, vinyl-based resin, and combinations thereof; (c) from about 0.2 to 20 percent solids by weight of a melamine crosslinking agent; and (d) from about 0.05 to 0.2 percent solids by weight of a surfactant.