Method for preparing moisture curable polymers containing randomly distributed sites of conjugated olefinic unsaturation
AssigneeExxon Research & Engineering Co.
InventorsFrancis P. Baldwin, James A. Rae, Gary Ver Strate
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Abstract
Disclosed is a method of preparing a moisture curable elastomer by reacting an elastomer containing randomly distributed sites of conjugated olefinic unsaturation with a cyclic unsaturated anhydride then blending the reaction product with a polyvalent metal compound and, optionally, a basic hydrolysis catalyst.
Claims29
A method for preparing an elastomeric polymer, curable by addition of a catalytic amount of water which comprises reacting a polymer containing randomly distributed sites of conjugated olefinic unsaturation, under anhydrous conditions, with up to 1 mol of a cyclic unsaturated anhydride per mol of conjugated units present in the polymer, then blending the reaction product with a polyvalent metal compound wherein the polyvalent metal compound is an oxide, hydroxide or alkoxide.
A method for preparing an elastomeric polymer, curable by addition of a catalytic amount of water, which comprises reacting a polymer containing randomly distributed sites of conjugated olefinic unsaturation under anhydrous conditions with up to 1 mol of a cyclic unsaturated anhydride per mol of conjugated units present in the polymer, then blending the reaction product with a polyvalent metal compound and a basic hydrolysis catalyst wherein the polyvalent metal compound is an oxide or a hydroxide.
A method for preparing a butyl polymer, curable by addition of a catalytic amount of water, having a number average molecular weight of about 5,000 to about 250,000 which comprises:
- a. dissolving a butyl polymer containing randomly distributed sites of conjugated olefinic unsaturation in a substantially inert solvent;
- b. reacting the polymer solution of (a) at a temperature of about 25.degree. C. to about 150.degree. C. with up to 1 mol of cyclic unsaturated anhydride per mol of conjugated olefinic units present in the polymer;
- and
- c. blending the reaction product of (b) with a polyvalent metal oxide or hydroxide of a metal selected from the group consisting of metals in Groups IIa and IIb or an alkoxide of a metal selected from the groups consisting of metals in Group IIIa and IVb of the Periodic Table of the Elements.
A method for curing, with a catalytic amount of water, an elastomer containing randomly distributed sites of conjugated olefinic unsaturation which comprises:
- a. reacting an elastomer containing randomly distributed sites of conjugated olefinic unsaturation, under anhydrous conditions, with up to 1 mol of a cyclic unsaturated anhydride per mol of conjugated olefinic units present in the polymer;
- b. blending the reaction product of (a) with a polyvalent metal compound wherein the polyvalent metal compound is an oxide or hydroxide;
- and
- c. reacting the blend of (b) with a catalytic amount of water.
An elastomeric polymer, which is curable by a catalytic amount of water, which comprises:
- a. the adduct obtained by reacting a polymer containing randomly distributed sites of conjugated olefinic unsaturation with up to 1 mol of a cyclic unsaturated anhydride per mol of conjugated olefinic units present in the polymer;
- and
- b. a polyvalent metal compound wherein the polyvalent metal compound is an oxide, hydroxide or alkoxide.
A butyl polymer, which is curable by a catalytic amount of water, having a number average molecule weight of about 5,000 to about 250,000 which comprises:
- a. the adduct obtained by reacting a butyl polymer containing randomly distributed sites of olefinic unsaturation with maleic anhydride;
- and
- b. a polyvalent metal oxide, hydroxide or alkoxide.
Dependencies are inferred from the claim text.