Multi-layer films and methods of forming same

摘要

A multi-layer film having a first film layer being at least partially formed from a polymer (A) and a polymer (B) and a second film layer being at least partially formed from the polymer (A), the polymer (B), a polymer (C), and optionally an opacifying agent, wherein at least one of the polymer (A), the polymer (B) and the polymer (C) is synthetic and is at least partially derived from a renewable resource such that the multi-layer film has a bio-based content of about 10% to about 100% using ASTM D6866-10, method B. Methods of forming multi-layer films are also provided.

主权项

1. A method, of forming a multi-layer film, comprising:
a. providing a renewable resource selected from the group consisting of plants, animals, fish, bacteria, fungi, and forestry products; b. deriving a monomer from the renewable resource and polymerizing the monomer to form a synthetic polymer; c. forming at least one of polymer (A), polymer (B) and polymer (C) from the synthetic polymer; d. processing a first film layer having an upper surface and a lower surface, the first film layer being at least partially formed from a polymer (A) and a polymer (B), wherein the first film layer comprises from about 75% to about 99% by weight of the polymer (A) and from about 1% to about 25% by weight of the polymer (B), wherein the polymer (A) comprises at least one of a low density polyethylene (LDPE) and a linear low density polyethylene (LLDPE) and the polymer (B) comprises a copolymer; e. processing a second film layer that is at least partially formed from polymer (A), polymer (B), from about 1% to about 35% by weight of a polymer (C), and optionally an opacifying agent, wherein polymer (C) comprises a homo polypropylene (homo-PP), and wherein at least one of polymer (A), polymer (B) and polymer (C) comprises the synthetic polymer to provide the multi-layer film having a bio-based content of about 10% to about 100% using ASTM D6866-10, method B; and f. at least partially overlying the second film layer onto one of the upper surface and the lower surface of the first film layer.