Claims
- 1. In a dispersion comprising a solvent, a plastic, a defoaming agent, a pigment, a pigment wetting agent and a thickening agent, the improvement which comprises employing as said defoaming agent
- (a) 80 to 100% by weight of polyoxyalkylenesiloxane copolymer of the formula:
- [R.sup.1 Si(OSiR.sub.2).sub.n ].sub.m Z.sub.m-1 (OR.sup.2).sub.m+2,
- in which
- R represents an optionally halogen-substituted alkyl group with up to 4 C atoms,
- R.sup.1 represents the substituted R or a phenyl radical,
- R.sup.2 represents a group of the composition ##STR10## Z represents the difunctional unit --O-- or ##STR11## and R.sup.3 denotes a hydrocarbon radical with up to 6 C atoms,
- R.sup.4 denotes independently of one another hydrogen or R.sup.3,
- n denotes a number between 3 and 40,
- m denotes a number between 1 and 15,
- x denotes a number between 0 and 68,
- y denotes a number between 0 and 52,
- x+y denotes a number between 1 and 68 and
- p denotes a number between 2 and 12, and
- (b) 6 to 10% by weight of a hydrophobic silicon dioxide,
- and employing an acrylate polymer as the plastic.
- 2. In the coating of a substrate with a plastic by applying the substrate a dispersion comprising a solvent, a plastic, a defoaming agent and a thickening agent, and allowing the applied dispersion to dry, the improvement which comprises employing as said defoaming agent
- [R.sup.1 Si(OSiR.sub.2).sub.n ].sub.m Z.sub.m-1 (OR.sup.2).sub.m+2,
- in which
- R represents an optionally halogen-substituted alkyl group with up to 4 C atoms,
- R.sup.1 represents the substituted R or a phenyl radical,
- R.sup.2 represents a group of the composition ##STR12## Z represents the difunctional unit --O-- or ##STR13## and R.sup.3 denotes a hydrocarbon radical with up to 6 C atoms,
- R.sup.4 denotes independently of one another hydrogen or R.sup.3,
- n denotes a number between 3 and 40,
- m denotes a number between 1 and 15,
- x denotes a number between 0 and 68,
- y denotes a number between 0 and 52,
- x+y denotes a number between 1 and 68 and
- p denotes a number between 2 and 12, and
- (b) 0-20% by weight of a hydrophobic silicon dioxide,
- and employing an acrylate polymer as the plastic, whereby the coating upon drying is substantially bubble-free.
- 3. A process according to claim 2, wherein the hydrophobic silicon dioxide is present in about 6 to 10% by weight of the defoaming agent.
Priority Claims (1)
Number |
Date |
Country |
Kind |
3038982 |
Oct 1980 |
DEX |
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Parent Case Info
This is a continuation of application Ser. No. 305,652, filed 9-25-1981, abandoned.
US Referenced Citations (5)
Continuations (1)
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Number |
Date |
Country |
Parent |
305652 |
Sep 1981 |
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