Low-emission dispersion paints, coating materials and synthetic resin dispersion plasters as well as processes for the preparation thereof

• US 5,708,077 A
• Filed: 11/15/1996
• Issued: 01/13/1998
• Est. Priority Date: 02/05/1988
• Status: Expired due to Fees

• Current Assignee: Celanese Emulsions Gmbh (Celanese Corporation)
• Original Assignee: Hoechst Aktiengesellschaft (Sanofi )
• Inventors: Braun, Helmut, Lonitz, Michael, Nolken, Ernst
• Primary Examiner(s): SMITH, JEFFREY
• Application Number:
  US08/746,741
• Time in Patent Office: 424 Days
• Field of Search: 524/457, 524/837, 524/806
• US Class Current: 524/806
• CPC Class Codes: C04B 2103/54 Pigments; Dyes
• CPC Class Codes: C04B 41/4988 Organosilicium-organic copolymers, e.g. olefins with terminal silane groups
• CPC Class Codes: C08F 6/006 Removal of residual monomers by chemical reaction, e.g. scavenging
• CPC Class Codes: C08L 2666/02 Organic macromolecular compounds, natural resins, waxes or and bituminous materials
• CPC Class Codes: C08L 2666/54 Inorganic substances
• CPC Class Codes: C09D 131/04 Homopolymers or copolymers of vinyl acetate
• CPC Class Codes: C09D 5/02 Emulsion paints including aerosols

Abstract

Production of low-emission dispersion paints, coating materials and synthetic resin dispersion plasters in the form of aqueous preparations based on aqueous synthetic resin dispersion copolymers derived from olefinically unsaturated monomers, having a pigment volume concentration (PVC) of at least 60% and containing water, fillers, pigments, synthetic resin dispersion copolymers and conventional auxiliaries, wherein the synthetic resin dispersion copolymers have a content of 0.05 to 2% by weight of monomer units derived from special unsaturated hydrolyzable organic silicon compounds and the aqueous copolymer dispersions possess a minimum film-forming temperature (MFT) of <10° C. preferably <5° C.and especially <2° C., the aqueous preparations according to the invention contain <0.1% by weight of volatile non-aqueous constituents, based on the total non-volatile part of the preparations, and the pH of the aqueous preparations is in the range from 5.5 to 10.

In particular, the low-emission aqueous preparations produced according to the invention are free of volatile organic solvents, volatile organic film-forming auxiliaries, low-molecular plasticizers, residual monomers from the preparation of the dispersion copolymer, other highly volatile non-aqueous constituents and malodorous by-products.

Use of the dispersion paints, coating materials and synthetic resin dispersion plasters as building-protection materials or as structural materials, especially in spaces which are inadequately ventilated and inhabited.

Claims

1. A process of preparing an aqueous preparation comprising an aqueous synthetic resin dispersion possessing a minimum film-forming temperature (MFT) of below 10°

C. by

a) free radical emulsion polymerization of olefinically unsaturated monomers in the presence of 0.05 to 0.4% by weight, based on the total amount of monomers, of an unsaturated hydrolyzable organic silicon compound of the formula I, ##STR3## in which R denotes an organic radical olefinically unsaturated in the ω

-position and R¹, R² and R³ which may be identical or different, denote halogen or the group --OZ, Z denoting primary or secondary alkyl radicals or acyl radicals optionally substituted by alkoxy groups, or hydrogen,

b) adjusting the pH of the aqueous dispersion in the range of 5.5 to 10 and subsequently

c) removing volatile alcoholic components formed by hydrolysis of compounds of formula I and volatile amounts of residual monomers by distillation to a content of volatile non-aqueous constituents in the aqueous preparation to below 0.1% by weight, based on the total non-volatile part, and

d) adding fillers, pigments and auxiliaries selected from the group consisting of wetting agents, dispersants, emulsifiers, protective colloids, thickeners, antifoams, dyes and preservatives.