Bp Chemicals Limited

James Graham Bonner

Anthony Keith Powell

Philip K Hodgson

A polymer blend comprises a polyketone and a high density polyethylene (HDPE) optionally grafted with at least one polymerisable ethylenically unsaturated carboxylic acid or derivative thereof. Such blends have good barrier properties and are suitable for packaging applications.

Polymer blends

A polymer blend comprised of a polyketone and linear low density polyethylene (LLDPE). The blend is suitable for use with foodstuffs and liquid hydrocarbons. In a preferred form of the invention, the polyketone has an alternating structure of (a) units derived from carbon monoxide and (b) units derived from one or more olefinically unsaturated compounds.

Food packaging comprises a blend of polyketone and PVC. The blends show good oxygen barrier properties without serious deterioration of moisture barrier performance. Terpolymers of ethylene, propylene and CO are preferred. PVC having a K-value of 50 to 80 are preferred.

Food packaging comprising polyketone/PVC blend

Adhesive blends

A polymer blend composition comprises a polyketone and PVC provided that the polyketone is not a propylene/CO copolymer having a molecular weight of less than 10,000. The softening point of PVC can be increased by blending with polyketones. Blends of polyketones and unplasticised PVC are particularly preferred.

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Edinburgh, United Kingdom

James Graham Bonner