Method for producing water based coating compositions

Details Method for producing water based coating compositions Method for producing water based coating compositions

2001-01-03

2002-08-13

Moore, Margaret G. (Department: 1712)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Processes of preparing a desired or intentional composition...

C523S435000, C523S501000, C524S501000, C524S506000, C524S588000, C524S589000, C525S029000, C525S100000, C525S446000, C525S453000, C525S476000, C525S477000

Reexamination Certificate

active

06433041

ABSTRACT:

CROSS-REFERENCE TO RELATED APPLICATIONS
Not applicable.
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT
Not applicable.
REFERENCE TO A MICROFICHE APPENDIX
Not applicable.
FIELD OF THE INVENTION
This invention relates to a method for producing water based coating compositions. More particularly, the invention is directed to an efficient method for producing water based coating compositions that have the ability to form highly scratch and abrasion resistant matte coatings in which crosslinked silicone particles are well dispersed.
BACKGROUND OF THE INVENTION
Japanese Laid Open (Kokai or Unexamined) Patent Application Number Hei 2-113079 (113,079/1990)/EP 0 365 009 A2 (Apr. 25, 1990), discloses blending crosslinked silicone particles into coating compositions to produce coating compositions that form matte coatings.
Since a uniform dispersion is not obtained when crosslinked silicone particles are blended into a water based coating composition, Japanese Laid Open (Kokai or Unexamined) Patent Application Number Hei 5-9409 (9,409/1993)/U.S. Pat. No. 5708057 (Jan. 13, 1998), teaches a method for preparing water based coating compositions in which crosslinked silicone particles are blended as a waterborne suspension into water based coating compositions.
Japanese Laid Open (Kokai or Unexamined) Patent Application Number Hei 11-140191 (140,191/1999) teaches that waterborne crosslinked silicone particle suspensions of crosslinked silicone particles, nonionic surfactant, ionic surfactant, and water, can be blended into water based coating compositions.
A problem with preparing water based coating compositions using waterborne crosslinked silicone particle suspensions is that the application of the resulting water based coating compositions produces matte coatings that have unacceptable scratch and abrasion resistance.
BRIEF SUMMARY OF THE INVENTION
Therefore, the object of this invention is to provide an efficient method for producing water based coating compositions that are able to form highly scratch and abrasion resistant matte coatings in which crosslinked silicone particles are well dispersed.
In particular, the method involves producing water based coating compositions by the addition to a water based coating composition of a waterborne suspension of crosslinked silicone particles that have an average diameter of 0.1 to 200 &mgr;m. Furthermore, the method for producing water based coating compositions is characterized in that the suspension is a waterborne suspension of crosslinked silicone particles afforded by effecting crosslinking of a condensation reaction crosslinkable silicone composition comprising (A) an organopolysiloxane that contains at least two silanol groups in each molecule, (B) a crosslinker, and (C) a condensation reaction catalyst. The crosslinking is effected in the emulsified composition in an aqueous solution of an anionic surfactant.
These and other features of the invention will become apparent from a consideration of the detailed description.


REFERENCES:
patent: 5387624 (1995-02-01), Morita et al.
patent: 5708057 (1998-01-01), Morita et al.
patent: 5928660 (1999-07-01), Kobayashi et al.
patent: 0 365 009 (1990-04-01), None

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