Functionalized elastomeric polymers
AssigneeShell Oil Company
InventorLinda R. Chamberlain
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Abstract
Selectively hydrogenated block polymers of an alkenyl aromatic compound and a conjugated alkadiene are functionalized by the presence of a plurality of carbamoyl substituents on aromatic rings in the aromatic portion of the polymer. Such carbamoyl-functionalized derivatives are produced by reaction of corresponding carboxylic acid-functionalized polymers by reaction with ammonia followed by application of heat. The carbamoyl-substituted polymers exhibit improved properties and form blends with engineering thermoplastics.
Claims15
In the process of producing a functionalized derivative of an elastomeric block polymer having at least one block of at least predominantly polymerized alkenyl aromatic compound and at least one block of an at least predominantly polymerized conjugated alkadiene, selectively hydrogenated in the aliphatic portion thereof, by the sequential steps of metallation, carboxylation and acidification, wherein the block copolymer has a peak molecular weight as determined by GPC or light scattering of about 11,000 to about 2,500,000, wherein the alkenyl aromatic block content is no more than about 55 wt %, and wherein no more than 25% of the unsaturation in the alkenyl aromatic block and at least 80% of the aliphatic unsaturation in the block copolymer is hydrogenated;
- the improvement of contacting the resulting carboxylic acid-functionalized, selectively hydrogenated block polymer thereby produced with ammonia and heating the resulting product to a temperature of at least about 180.degree. C.
In the process of producing a functionalized derivative of an elastomeric block polymer having at least one block of at least predominantly polymerized styrene and at least one block of at least predominantly polymerized butadiene or isoprene, selectively hydrogenated in the aliphatic portion thereof, by the sequential steps of metallation, carboxylation and acidification, wherein the block copolymer has a peak molecular weight as determined by GPC or light scattering of about 11,000 to about 2,500,000, wherein the alkenyl aromatic block content is no more than about 55 wt %, and wherein no more than 25% of the unsaturation in the alkenyl aromatic block and at least 80% of the aliphatic unsaturation in the block copolymer is hydrogenated;
- the improvement of contacting the resulting carboxylic acid-functionalized, selectively hydrogenated block polymer thereby produced with ammonia and heating the resulting product at a temperature of at least about 180.degree. C.
A carbamoyl-functionalized, selectively hydrogenated block polymer derived from a base block polymer of at least one block of predominantly polymerized alkenyl aromatic compound and at least one block of at least predominantly polymerized conjugated alkadiene, wherein the block copolymer has a peak molecular weight as determined by GPC or light scattering of about 11,000 to about 2,500,000, wherein the alkenyl aromatic block content is no more than about 55 wt %, and wherein no more than 25% of the unsaturation in the alkenyl aromatic and at least 80% of the aliphatic unsaturation in the block copolymer is hydrogenated;
- wherein the carbamoyl functionalizing groups are present as substituents on aromatic rings.
Dependencies are inferred from the claim text.