Bio-resins

摘要

A bio-resin composition contains cellulose acetate and a biodegradable secondary polymer in a ratio of at least 10:1 by weight of the total weight of the composition wherein the secondary polymer is an aliphatic polyester such as polybutylene succinate or an aliphatic co-polyester such as polybutylene succinate adipate or an aliphatic/aromatic polyester such as polybutylene adipate terephthalate. The secondary polymer may be present in an amount up to 10% by weight, more preferably up to 6% by weight and more preferably still in the range 2% to 3% by weight of the total weight of the composition where the combined amount of secondary polymer and cellulose acetate may be up to 85% of the total weight of the composition.

主权项

1. A bio-resin composition containing a blend of polymers including cellulose diacetate and a biodegradable secondary polymer wherein the ratio of cellulose diacetate to biodegradable secondary polymer is at least 20:1 with the combined amount of cellulose diacetate and biodegradable secondary polymer being up to 85% by weight of the total weight of the composition, wherein the secondary polymer provides the bio-resin composition with increased melt strength without substantially reducing softening temperature relative to a cellulose diacetate composition without a secondary polymer, wherein the biodegradable secondary polymer is selected from the group comprising aliphatic, aromatic and mixed aliphatic/aromatic polyesters, and the composition further including at least one plasticiser and at least one lubricant, the plasticiser being present in an amount in the range 5% to 25% by weight of the total weight of the composition.