Recyclable PET film
AssigneeMitsubishi Polyester Film GmbH
InventorsAlper Ünal, Thiemo Herbst
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Abstract
The present invention relates to a multilayer, coextruded polyester film that includes at least one outer layer (A) and a base layer (B), in which the at least one outer layer (A) includes to an extent of at least 60 wt % of a copolyester that includes units derived from dicarboxylic acids and diols, in which the units derived from dicarboxylic acids include at least 65 mol % of units derived from terephthalic acid and at least 5 mol % of units derived from 5-sulfo-isophthalic acid and the units derived from diols include at least 90 mol % of units derived from ethylene glycol. The present invention further relates to a process for producing the film according to the invention, to the use thereof and to a process for recycling the polyester film according to the invention.
Claims20
A multilayer, coextruded film formed from polymer consisting of polyester and copolyester, said film comprising at least one outer layer (A) and a base layer (B), wherein
- the at least one outer layer (A) consists to an extent of at least 60 wt % of a copolyester consisting of units derived from dicarboxylic acids and diols, wherein
- the units derived from dicarboxylic acids comprise at least 65 mol % of units derived from terephthalic acid and at least 5 mol % of units derived from 5-sulfo-isophthalic acid and
- the units derived from diols comprise at least 90 mol % of units derived from ethylene glycol;
- the polyester is formed from dicarboxylic acid consisting of terephthalic acid and optional isophthalic acid;
- and
- the copolyester is formed from dicarboxylic acid consisting of terephthalic acid, 5-isophthalic acid and optional isophthalic acid.
Dependencies are inferred from the claim text.