Dupont Teijin Films U.S. Limited Partnership

E.i. Dupont De Nemours and Company

Karl Rakos

Robert William Eveson

Julian Neal Robinson

Noel Stephen Brabbs

William Alasdair MacDonald

Dominic Hoy

Moira Logan

Damian Peter Tuffin

Paul David Alan Mills

David Brown

Robert W Eveson

Robert Eveson

Duncan Henry Mackerron

Debbie A Stephenson

Jackie Symonds

A coextruded biaxially oriented composite film comprising a polyester substrate layer and disposed on one or both surfaces thereof a strippable sacrificial layer, wherein said strippable sacrificial layer comprises an ethylene-methacrylic acid (EMAA) copolymer.

Film comprising a strippable sacrificial layer for reduction of surface defects in a substrate

An interferometric method for profiling the topography of a sample surface comprises: (i) a first interferometric profiling step at a first magnification Mto produce a map comprising pixels with planar (X,Y)-coordinates corresponding to the area of the sample surface, (ii) identifying pixel(s) which meet or exceed a Cut-Off Threshold, and meet or exceed a parameter N; (iii) identifying pixel(s) for which no z-coordinate has been recorded; (iv) generating a Low Magnification Frame File (LMFF) which comprises the (X,Y) coordinates of the pixels derived from steps (ii) and (iii); (v) a second interferometric profiling step at a second magnification M, wherein M&#x3e;M, wherein only selected regions of the sample surface are analysed, said selected regions comprising the features associated with the (X,Y)-coordinates of the pixels in the Low Magnification Frame File; and further comprising a step selected from: (vi) analysing the output of the second interferometric profiling step to differentiate between an intrinsic defect and an extrinsic defect; (vii) assessing whether said sample surface meets one or more quality control standard(s) and/or one or more target property or properties; and (viii) assessing whether said sample surface is suitable as a surface for subsequent coating.

Metrology method

A method of manufacture of a coated polymeric film which comprises performing in sequence the steps of:

Coated polymeric substrates having improved surface smoothness suitable for use in flexible electronic and opto-electronic devices

A composite film comprising a heat-stabilised, heat-set, oriented poly(ethylene naphthalate) substrate, and a coating layer having a surface; wherein said substrate exhibits one or more of:

The use of a coating composition comprising: (a) from about 5 to about 50 weight percent solids, the solids comprising from about 10 to about 70 weight percent silica and from about 90 to about 30 weight percent of a partially polymerized organic silanol of the general formula RSi(OH), wherein R is selected from methyl and up to about 40% of a group selected from the group consisting of vinyl, phenyl, gamma-glycidoxypropyl, and gamma-methacryloxypropyl, and (b) from about 95 to about 50 weight percent solvent, the solvent comprising from about 10 to about 90 weight percent water and from about 90 to about 10 weight percent lower aliphatic alcohol, wherein the coating composition has a pH of from about 3.0 to about 8.0, for the purpose of improving the surface smoothness of a polymeric substrate, particularly a heat-stabilised, heat-set, oriented polyester substrate, and use of said coated substrate in the manufacture of an electronic or optoelectronic device containing a conjugated conductive polymer.

A composite film is described which consists of a primary unfilled polyester layer and a secondary polyester layer containing from 1 to 8% by weight, based on the weight of the secondary polyester layer, of finely divided silica particles having a volume weighted mean particle size diameter D&lsqb;4,3&rsqb; of from 2.3 to 6.2 micrometers. The composite film is used in backlit displays such as illuminated signboards and provides uniform light transmission while maintaining the same strength of illumination at all points over the area of the display.

Growing community of inventors

Durham, United Kingdom

Karl Rakos