Lawrence W Leech

6846570, Jan 25, 2005

Aug 16, 2001

10/048782

Lawrence D. Leech - West Chester PA, US
Daniel C. Chung - Princeton NJ, US
Michael W. Miller - Exton PA, US

Whitford Corporation - West Chester PA

C08L 7700
C08L 7908
B32B 2734
B32B 2708

4284735, 4284744, 4284758, 4284763, 524413, 524430, 524444, 524514, 525178, 525179, 525180

Multiple coat non-stick coating systems, as well as articles coated with such non-stick coating systems, are provided. The primer () of the multiple coat system includes a fluoropolymer () copolymer, such as a fluoropolymer terpolymer including tetrafluoroethylene, hexafluoropropylene, and vinylidene fluoride monomers, which fluoropolymer copolymers are referred to collectively as THV. The multiple coat system exhibits excellent substrate adhesion and release properties, and the primer exhibits excellent primer-substrate adhesion and primer-topcoat adhesion. The multiple coat system is additionally resistant to separation failure at the interface between the binder () and fluoropolymer components of the primer, exhibits excellent adhesion to smooth substrates (), and may also include a high level of fillers to provide increased damage resistance without compromising the above benefits.

7026036, Apr 11, 2006

Aug 16, 2001

10/048666

Lawrence D. Leech - West Chester PA, US
Daniel C. Chung - Princeton NJ, US
Michael W. Miller - Exton PA, US

Whitford Corporation - West Chester PA

B32B 27/20
B32B 27/30
B32B 27/34
C08K 3/22
C08L 77/00

428142, 4284111, 428421, 428422, 428457, 4284735, 4284744, 524430, 525178, 525179

Single coat coating systems (), as well as articles coated with such non-stick coating systems, are provided. The single coat system includes a fluoropolymer copolymer (), such as fluoropolymer terpolymer including tetrafluoroethylene, hexafluoropropylene, and vinylidene fluoride monomers, with fluoropolymer copolymers are referred to collectively as THV. The single coat system exhibits excellent substrates adhesion and release properties, is resistant to separation failure at the interface between the binder () and fluoropolymer components (), and exhibits adhesion to smooth substrates (). The single coat system may also include a high level of fillers to provide increased damage resistance without compromising the above benefits.

8227548, Jul 24, 2012

Sep 25, 2009

12/567330

Leonard W. Harvey - Downingtown PA, US
Lawrence D. Leech - West Chester PA, US

Whitford Corporation - Elverson PA

C08L 27/02
C08F 214/26
C08F 214/08
C08G 75/02

525199, 525200, 524519, 524520

A fluoropolymer coating composition that may be applied over a primer and/or at least one midcoat in a non-stick coating system. The coating composition may be prepared and applied in the form of a liquid dispersion, and includes at least one fluoropolymer base component, such as polytetrafluoroethylene (PTFE) and, in particular, at least one high molecular weight PTFE (HPTFE). The coating composition additionally includes a blended fluoropolymer composition. The blended fluoropolymer composition is a blend of at least one low molecular weight PTFE (LPTFE) and at least one melt-processible fluoropolymer. After application directly to a substrate or over an underlying coating, the coating demonstrates improved abrasion and scratch resistance, as well as improved release characteristics, as compared to known coatings that include only HPTFE or HPTFE with a small amount of melt processible fluoropolymer.

8349434, Jan 8, 2013

Mar 2, 2012

13/410357

Leonard W. Harvey - Downingtown PA, US
Lawrence D. Leech - West Chester PA, US

Whitford Corporation, Inc. - Elverson PA

D06N 7/04
G11B 5/64
C08L 27/14

428141, 525199

A fluoropolymer coating composition that may be applied over a primer and/or at least one midcoat in a non-stick coating system. The coating composition may be prepared and applied in the form of a liquid dispersion, and includes at least one fluoropolymer base component, such as polytetrafluoroethylene (PTFE) and, in particular, at least one high molecular weight PTFE (HPTFE). The coating composition additionally includes a blended fluoropolymer composition. The blended fluoropolymer composition is a blend of at least one low molecular weight PTFE (LPTFE) and at least one melt-processible fluoropolymer. After application directly to a substrate or over an underlying coating, the coating demonstrates improved abrasion and scratch resistance, as well as improved release characteristics, as compared to known coatings that include only HPTFE or HPTFE with a small amount of melt processible fluoropolymer.

8586677, Nov 19, 2013

Apr 11, 2011

13/391353

Leonard W. Harvey - Downingtown PA, US
Helen L. Brain - Merseyside, GB
Susan J. Roberts-Bleming - Cheshire, GB
Lawrence D. Leech - West Chester PA, US
Thomas J. Bate - Glenview IL, US

Whitford Corporation - Elverson PA

C08L 27/12

525199, 525200

Blended fluoropolymer compositions that, in one exemplary application, may be applied as a coating to a substrate and, optionally, may be applied to a substrate that has been previously coated with a primer or basecoat and/or a midcoat. In one embodiment, the composition is a blend of at least one high molecular weight trace modified polytetrafluoroethyelene (TMHPTFE) and at least one melt-processible fluoropolymer (MPF). After being applied to the substrate, optionally over a primer or basecoat and/or midcoat, and then cured, the present compositions form coatings that demonstrate improved abrasion resistance and/or improved release characteristics and/or increased translucency/transparency and/or improved impermeability. The present compositions may also be used to produce films having a high degree of clarity and impermeability. The present compositions in powder form may be melt or paste extruded to form articles with improved impermeability.

20110287251, Nov 24, 2011

Feb 10, 2010

13/146352

Lawrence D. Leech - West Chester PA, US
Daniel C. Chung - Princeton NJ, US

WHITFORD CORPORATION - Elverson PA

B32B 5/16
C08K 3/36

428327, 524493

A fluoropolymer coating that includes nanoparticles for providing the coating with improved release characteristics together with improved abrasion resistance. In one embodiment, the nanoparticles are silica particles that may be incorporated into the coating by adding colloidal silica to the liquid coating formulation that is applied to a substrate, typically over a primer, and then cured. After the coating is cured, the coating demonstrates enhanced release characteristics together with improved abrasion resistance. It has been unexpectedly observed that a combination of desired release characteristics and improved abrasion resistance is found when the average particle size of the nanoparticles is between 30 and 120 nm, with the abrasion resistance generally increasing with increasing particle size.

55609783, Oct 1, 1996

Jun 1, 1995

8/457995

Lawrence D. Leech - West Chester PA

Whitford Corporation - West Chester PA

B32B 2708
B32B 516
B32B 2734
B32B 2700

428141

A basecoat for a nonstick coating system wherein the basecoat comprises a high temperature binder resin, preferably polyamideimide resin, and a filamentary powder, preferably a nickel powder, which is combined with the high temperature binder to yield a spongelike coating which with appropriate application has a rough surface and an internal structure containing interlocking channels. These channels may be impregnated by subsequently applied coatings, especially nonstick fluoropolymer coatings.

54687985, Nov 21, 1995

Feb 18, 1994

8/198445

Lawrence D. Leech - West Chester PA

Whitford Corporation - West Chester PA

C08K 308
C08L 7908

524440

A basecoat for a nonstick coating system wherein the basecoat comprises a high temperature binder resin, preferably polyamideimide resin, and a filamentary powder, preferably a nickel powder, which is combined with the high temperature binder to yield a spongelike coating which with appropriate application has a rough surface and an internal structure containing interlocking channels. These channels may be impregnated by subsequently applied coatings, especially nonstick fluoropolymer coatings.