Treatment of natural polymer based materials and the products based thereon

A method for modifying the surface of a natural polymeric material to alter its surface properties and to improve its surface interaction with other materials comprising at least steps i), ii) and iii):

• i) oxidizing at least part of the surface of the natural polymeric material,
• ii) contacting the oxidized surface with a modifying agent comprising (A) multi-functional amine containing organic compounds to form a modified surface, and
• iii) contacting the modified surface with an adhesive or coating to form a bond therewith,
• and wherein the process further comprises applying a physical field during step i) or step ii).

A method for modifying the surface of a natural polymeric material to alter its surface properties and to improve its surface interaction with other materials comprising at least steps i), ii) and iii):

• i) oxidizing at least part of the surface of the natural polymeric material,
• ii) contacting the oxidized surface with a modifying agent comprising (A) multi-functional amine containing organic compounds to form a modified surface, and
• iii) contacting the modified surface with an adhesive or coating to form a bond therewith,
• wherein the natural polymeric material is a cellulosic material and the modifying agent is a multifunctional amine containing compound and a cross-linking agent reactive to the amine to provide a cross-linked network grafted to the surface of said cellulosic material.

A method for modifying the surface of a natural polymeric material to alter its surface properties and to improve its surface interaction with other materials comprising at least steps i), ii) and iii):

• i) oxidizing at least part of the surface of the natural polymeric material,
• ii) contacting the oxidized surface with a modifying agent comprising (A) multi-functional amine containing organic compounds to form a modified surface, and
• iii) contacting the modified surface with an adhesive or coating to form a bond therewith,
• wherein the modifying agent is a multi-functional amine containing compound and a crosslinker reactive with the multi-functional amine and a co-crosslinker or a functional compound to form a crosslinked layer on the surface and provide functional properties.