US 7,498,125 B2
	Non-transparent microvoided biaxially stretched film, production process therefor and process for obtaining a transparent pattern therewith
Dirk Quintens, Westerlo (Belgium)
Assigned to Agfa-Gevaert N.V., Mortsel (Belgium)
Filed on Oct. 02, 2007, as Appl. No. 11/866,112.
Claims priority of provisional application 60/908545, filed on Mar. 28, 2007.
Claims priority of provisional application 60/908542, filed on Mar. 28, 2007.
Claims priority of provisional application 60/908536, filed on Mar. 28, 2007.
Claims priority of provisional application 60/908526, filed on Mar. 28, 2007.
Claims priority of provisional application 60/850512, filed on Oct. 10, 2006.
Claims priority of provisional application 60/850511, filed on Oct. 10, 2006.
Claims priority of application No. 06121665 (EP), filed on Oct. 03, 2006; application No. 06121669 (EP), filed on Oct. 03, 2006; application No. 07104947 (EP), filed on Mar. 27, 2007; application No. 07104948 (EP), filed on Mar. 27, 2007; application No. 07104950 (EP), filed on Mar. 27, 2007; and application No. 07104953 (EP), filed on Mar. 27, 2007.
Prior Publication US 2008/0096143 A1, Apr. 24, 2008
Int. Cl. G03C 1/76 (2006.01)

U.S. Cl. 430—536  [430/290; 430/346; 430/964; 428/315.5]

28 Claims

1. A non-transparent microvoided biaxially stretched self-supporting non-laminated polymeric film, the film comprising linear polyester as a continuous phase and dispersed uniformly therein an amorphous high polymer with a higher glass transition temperature than the glass transition temperature of said continuous phase which is non-crosslinked optionally with a crystalline high polymer having a higher melting point than the glass transition temperature of said continuous phase, wherein said linear polyester consists essentially of aromatic dicarboxylate and aliphatic dimethylene monomer units; said polymeric film has an optical density measured in transmission with a visible filter; and at least 50% of said optical density is due to microvoids.