Modifiers for high nitrile polymers
AssigneeMonsanto Company
InventorI. Luis Gomez
Life of this patent
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Abstract
Disclosed herein are high nitrile polymers which have been compounded with a modifier which is a combination of (1) a C.sub.12 to C.sub.28 saturated aliphatic fatty acid ester of glycerol or sorbitan and (2) a polyoxyethylene sorbitan ester. The amount of modifier used is in the range of from 0.01 to 1.0 percent by weight based on the weight of the nitrile polymer. The compounded polymers exhibit lower melt viscosity and increased melt flow. The modifiers also provide improved clarity, gloss and, in certain instances, articles molded from the compounded nitrile polymer exhibit lower residual monomer levels.
Claims21
A nitrile polymer which has been compounded with a modifier which is a combination of (1) a C.sub.12 to C.sub.28 saturated aliphatic fatty acid ester of a compound selected from the group consisting of glycerol and sorbitan;
- and (2) a polyoxyethylene sorbitan ester of a C.sub.12 to C.sub.28 saturated fatty acid, wherein the polyoxyethylene contains from 4 to 30 oxyethylene units;
- wherein the weight ratio of component (1) to component (2) is in the range of from 80/20 to 20/80;
- and wherein the amount of modifier used is in the range of from 0.01 to 1.0% by weight based on the weight of the nitrile polymer.
An acrylonitrile polymer containing from 60 to 83% by weight of acrylonitrile which has been compounded with a modifier which is a combination of (1) a C.sub.16 to C.sub.20 saturated aliphatic fatty acid ester of a compound selected from the group consisting of glycerol and sorbitan;
- and (2) a polyoxyethylene sorbitan ester of a C.sub.16 to C.sub.20 saturated fatty acid, wherein the polyoxyethylene contains from 16 to 24 oxyethylene units, wherein the weight ratio of component (1) to component (2) is in the range of from 80/20 to 20/80;
- and wherein the amount of modifier used is in the range from 0.01 to 0.5% by weight based on the weight of the acrylonitrile polymer.
An acrylonitrile polymer containing from 60 to 83% by weight of acrylonitrile which has been compounded with a modifier which is a combination of (1) a compound selected from the group consisting of glyceryl monostearate and sorbitan monostearate;
- and (2) polyoxyethylene(20) sorbitan tristearate;
- wherein the weight ratio of component (1) to component (2) is in the range of from 80/20 to 20/80;
- and wherein the amount of modifier used is in the range from 0.01 to 0.5% by weight based on the weight of the acrylonitrile polymer.
Dependencies are inferred from the claim text.