Polymeric microspheres for low-friction surfaces
AssigneeMinnesota Mining and Manufacturing Company
InventorsChi-Ming Tseng, Chung I. Young, Manisha Sarkar
Life of this patent
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Abstract
The present invention relates to polymeric microspheres comprised of short-chain diol diacrylate homopolymers or copolymers of diol diacrylates and long-chain acrylate esters, which exhibit excellent antifriction characteristics when applied on the surface of plastic sheets. Treated sheets exhibit a significantly lower coefficient of friction than sheets treated with commercially-available microspheres.
Claims11
A bead having a mean bead diameter of from about 0.1 to about 50 microns, said bead comprising:
- (a) about 20 to about 100 percent by weight of polymerized diol di(meth)acrylate having a viscosity of about 1 mPa.s to about 400 mPa.s of the formula
- CH.sub.2 .dbd.CR.sup.2 COOC.sub.n H.sub.2n OOCCR.sup.2 .dbd.CH.sub.2
- wherein
- R.sup.2 is H or CH.sub.3 ;
- and
- n is an integer of about 4 to about 18;
- (b) about 0 to about 80 percent by weight of at least one copolymerized vinyl monomer of the formula
- CH.sub.2 .dbd.CR.sup.2 COOC.sub.m H.sub.2m+1
- wherein
- R.sup.2 is H or CH.sub.3 ;
- and
- m is an integer of about 12 to about 40;
- (c) about 0 to about 30 percent by weight of at least one copolymerized ethylenically unsaturated monomer selected from the group consisting of vinyl esters, acrylic esters, methacrylic esters, styrene, styrene derivatives, and mixtures thereof;
- and
- (d) about 0 to about 10 percent by weight of at least one organosilane coupling agent selected from the group consisting of glycidoxyalkyl trimethoxysilanes and (aminoalkylamino) alkyl trimethoxysilanes;
- wherein the weight percentages are based on the total weight of (a) plus (b) plus (c) plus (d).
A bead having a mean bead diameter of from about 0.1 to about 50 microns, said bead comprising:
- (a) about 20 to about 99 percent by weight of polymerized diol di(meth)acrylate having a viscosity of about 1 mPa.s to about 400 mPa.s of the formula
- CH.sub.2 .dbd.CR.sup.2 COOC.sub.n H.sub.2n OOCCR.sup.2 .dbd.CH.sub.2
- wherein
- R.sup.2 is H or CH.sub.3 ;
- and
- n is an integer of about 4 to about 18;
- (b) about 1 to about 79 percent by weight of at least one copolymerized vinyl monomer of the formula
- CH.sub.2 .dbd.CR.sup.2 COOC.sub.m H.sub.2m+1
- wherein
- R.sup.2 is H or CH.sub.3 ;
- and
- m is an integer of about 12 to about 40;
- (c) about 0 to about 30 percent by weight of at least one copolymerized ethylenically unsaturated monomer selected from the group consisting of vinyl esters, acrylic esters, methacrylic esters, styrene, styrene derivatives, and mixtures thereof;
- and
- (d) about 0 to about 10 percent by weight of at least one organosilane coupling agent selected from the group consisting of glycidoxyalkyl trimethoxysilanes and (aminoalkylamino) alkyl trimethoxysilanes;
- wherein the weight percentages are based on the total weight of (a) plus (b) plus (c) plus (d).
A bead having a mean bead diameter of from about 0.1 to about 50 microns, said bead comprising:
- (a) about 20 to about 98 percent by weight of polymerized diol di(meth)acrylate having a viscosity of about 1 mPa.s to about 400 mPa.s of the formula
- CH.sub.2 .dbd.CR.sup.2 COOC.sub.n H.sub.2n OOCCR.sup.2 .dbd.CH.sub.2
- wherein
- R.sup.2 is H or CH.sub.3 ;
- and
- n is an integer of about 4 to about 18;
- (b) about 1 to about 79 percent by weight of at least one copolymerized vinyl monomer of the formula
- CH.sub.2 .dbd.CR.sup.2 COOC.sub.m H.sub.2m+1
- wherein
- R.sup.2 is H or CH.sub.3 ;
- and
- m is an integer of about 12 to about 40;
- (c) about 1 to about 29 percent by weight of at least one copolymerized ethylenically unsaturated monomer selected from the group consisting of vinyl esters, acrylic esters, methacrylic esters, styrene, styrene derivatives, and mixtures thereof;
- and
- (d) about 0 to about 10 percent by weight of at least one organosilane coupling agent selected from the group consisting of glycidoxyalkyl trimethoxysilanes and (aminoalkylamino) alkyl trimethoxysilanes;
- wherein the weight percentages are based on the total weight of (a) plus (b) plus (c) plus (d).
Dependencies are inferred from the claim text.