Abrasion resistant coatings comprising silicon dioxide dispersions
AssigneeMinnesota Mining and Manufacturing Company
InventorZayn Bilkadi
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Abstract
Transparent abrasion resistant coatings capable of withstanding 1000 hours of accelerated weathering are comprised of colloidal silicon dioxide particles dispersed in ethylenically unsaturated aliphatic and/or cycloaliphatic monomers that are substituted by a protic group. The coatings are useful in protecting plastic, wood, metal and ceramic surfaces.
Claims15
A coating composition curable to an abrasion and weather resistant coating comprising a non-aqueous dispersion of colloidal silicon dioxide particles of diameters less than 100 millimicrometers in a protic group-substituted ester or amide of acrylic or methacrylic acid wherein the protic group-substituted ester or amide or acrylic acid is one or more compounds having the formula:
- A.sup.1 --Z--A.sup.2
- wherein A.sup.1 and A.sup.2 independently are poly(acryloyloxy)-alkoxypropyl groups having the general formula:
- ##STR7## in which each R.sup.3 is independently a hydrogen atom or methyl group;
- m is an integer of 1 to 5;
- R.sup.4 is the residue of an aliphatic polyol having (m+1) primary hydroxyl groups (said residue being formed by the removal of hydroxy groups from the polyol) and containing 1 to 10 carbon atoms and optionally one ether oxygen atoms;
- and
- z is a heterocyclic group of the formula:
- ##STR8## wherein X is a divalent group which is required to complete a five or six membered heterocyclic ring.
Dependencies are inferred from the claim text.