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US20090246534: CURABLE COMPOSITIONS

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Filing Information

Inventor(s) Thomas J. Staunton · Zhicheng Li · Robert W. Green · Weilin Tang ·
Assignee(s) THE SHERWIN-WILLIAMS COMPANY ·
Correspondent THE SHERWIN-WILLIAMS COMPANY ·
Application Number US12409560
Filing date 03/24/2009
Publication date 10/01/2009
Predicted expiration date 03/24/2029
U.S. Classifications 428/423.1  · 524/300  ·
International Classifications B32B2740  · C08K509  ·
Kind CodeA1
18 Claims, No Drawings


Abstract

This invention relates to a curable composition comprising a solvent solution of a mixture comprising: (i) at least one hydroxy-functional acrylic polymer having a Tg of about 25° C. or lower; and (ii) at least one hydroxy-functional polyester having a Tg of 0° C. or lower; (iii) at least one polyisocyanate having an average functionality of ≧4; (iv) a metal catalyst, such as a tin compound, for accelerating the isocyanate/hydroxyl reaction; and (v) optionally a pot-life extending amount of propionic acid.

Independent Claims | See all claims (18)

  1. 1. A curable composition comprising a solvent solution of a mixture comprising: (i) at least one hydroxy-functional acrylic polymer having a Tg of about 25° or lower; (ii) at least one hydroxy-functional polyester having a Tg of 0° or lower; (iii) at least one polyisocyanate having an average isocyanate functionality of ≧4; (iv) a metal catalyst for accelerating the isocyanate/hydroxyl reaction; and (v) propionic acid.
  2. 10. A curable composition comprising (on a weight solids basis of the vehicle solids): (i) 30% to 70% of a hydroxy functional acrylic polymer having a number average molecular weight less than about 5,000, and preferably less than 3,000; (ii) 20% to 50% parts by weight of a hydroxy-functional polyester polyol; (iii) 10-55% of a polyisocyanate; (iv) at least 0.01% of a tin catalyst compound; and (v) 0.1 to about 3.0% propionic acid.
  3. 13. A multi-layer automotive coating composition comprising: (i) a pigmented basecoat; and (ii) a clearcoat applied over the basecoat, said clearcoat comprising a curable composition comprising a solvent solution of a mixture comprising: (a) at least one hydroxy-functional acrylic polymer having a Tg of about 25° or lower; (b) at least one hydroxy-functional polyester having a Tg of 0° or lower; (c) at least one polyisocyanate having an average isocyanate functionality of ≧4; (d) a metal catalyst for accelerating the isocyanate/hydroxyl reaction; and (e) propionic acid.

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