Paul N Dunlap

US Patent:

7078104, Jul 18, 2006

Filed:

Feb 22, 2002

Appl. No.:

10/081464

Inventors:

Paul N. Dunlap - Littleton CO, US

Assignee:

The Gates Corporation - Denver CO

International Classification:

B32B 15/06

US Classification:

428457, 428450, 428461, 428462, 428463, 428465

Abstract:

A bonded part such as a rubber to metal bonded part and process for producing a bonded part including a rubber and metal part, and particularly for producing an automotive torsional vibration damper, comprising the steps of placing uncured elastomer composition comprising an elastomer, at least one curative, and preferably, at least one rubber-to-metal adhesive adjuvant into a shape-forming mold, and curing the elastomer in two stages, wherein in the first curing stage the elastomer composition is less than fully cured and in the second curing stage, preferably performed with the elastomer composition in contact with a metal surface of the rubber and metal part, the elastomer composition is at least substantially fully cured. According to one embodiment, the present invention allows for the elimination of the step of applying an adhesive to the metal surface prior to application of the elastomer composition.

US Patent:

7166678, Jan 23, 2007

Filed:

Mar 31, 2004

Appl. No.:

10/815132

Inventors:

Paul N. Dunlap - Denver CO, US
Bobbie E. South - Dryden MI, US

Assignee:

The Gates Corporation - Denver CO

International Classification:

C08F 210/10
C08F 210/08
C08L 23/16
B32B 15/06

US Classification:

525242, 5253317, 5253325, 428344, 428355 R, 428416

Abstract:

A torsional vibration damper or other vibration damping device with a rubber vibration absorbing element. The rubber element is a peroxide-cured composition comprising 100 parts of ethylene-alpha-olefin elastomer, and 20 to 100 parts of substantially isobutylene or butene polymer having a viscosity average molecular weight greater than about 5000. The polymer may also be a copolymer of isobutylene and isoprene. The addition of the isobutylene polymer to the ethylene-alpha-olefin elastomer composition increases the vibration damping character of the rubber.

US Patent:

7235028, Jun 26, 2007

Filed:

Apr 12, 2002

Appl. No.:

10/121556

Inventors:

Dieter Martin - Lakewood CO, US
Harry D. Visser - Lakewood CO, US
Paul N. Dunlap - Centennial CO, US

Assignee:

The Gates Corporation - Denver CO

International Classification:

F16G 1/06

US Classification:

474264

Abstract:

A belt having a body, a tensile member and an outer surface. The body comprises an elastomer. An outer surface of the belt having a profile, foe example teeth. A layer of Ultra high molecular weight polyethylene thermoplastic (UHMWPE) is bonded to the profile surface. The layer bonded to the profile surface having a low softening point allowing it to conform to a mold shape prior to cure of the rubber body material. The layer having a molecular weight in the range of 3-7 million grams per mole. The layer causes the belt to exhibit superior abrasion resistance and flexibility while reducing the cost per belt as compared to fabric jacket belts. The UHMWPE jacket belt has significantly reduced dust and debris production during operation.

US Patent:

7291241, Nov 6, 2007

Filed:

Oct 26, 2004

Appl. No.:

10/973804

Inventors:

Paul N. Dunlap - Littleton CO, US

Assignee:

The Gates Corporation - Denver CO

International Classification:

B29C 65/00
B29C 43/00
F16F 15/129

US Classification:

156245, 1563082, 156311, 464 684

Abstract:

A bonded part such as a rubber to metal bonded part and process for producing a bonded part including a rubber and metal part, and particularly for producing an automotive torsional vibration damper, comprising the steps of placing uncured elastomer composition comprising an elastomer, at least one curative, and preferably, at least one rubber-to-metal adhesive adjuvant into a shape-forming mold, and curing the elastomer in two stages, wherein in the first curing stage the elastomer composition is less than fully cured and in the second curing stage, preferably performed with the elastomer composition in contact with a metal surface of the rubber and metal part, the elastomer composition is at least substantially fully cured. According to one embodiment, the present invention allows for the elimination of the step of applying an adhesive to the metal surface prior to application of the elastomer composition.

US Patent:

20050093205, May 5, 2005

Filed:

Nov 18, 2004

Appl. No.:

10/991452

Inventors:

Dieter Martin - Lakewood CO, US
Harry Visser - Lakewood CO, US
Paul Dunlap - Centennial CO, US

International Classification:

B29C035/00

US Classification:

264326000, 156137000

Abstract:

A belt having a body, a tensile member and an outer surface. The body comprises an elastomer. An outer surface of the belt having a profile, foe example teeth. A layer of Ultra high molecular weight polyethylene thermoplastic (UHMWPE) is bonded to the profile surface. The layer bonded to the profile surface having a low softening point allowing it to conform to a mold shape prior to cure of the rubber body material. The layer having a molecular weight in the range of 3-7 million grams per mole. The layer causes the belt to exhibit superior abrasion resistance and flexibility while reducing the cost per belt as compared to fabric jacket belts. The UHMWPE jacket belt has significantly reduced dust and debris production during operation.

US Patent:

20100330352, Dec 30, 2010

Filed:

Jun 30, 2009

Appl. No.:

12/494951

Inventors:

Yuding Feng - Rochester Hills MI, US
Lin Zhu - Rochester Hills MI, US
Yahya Hodjat - Oxford MI, US
Paul N. Dunlap - Englewood CO, US

Assignee:

Gates Corporation - Denver CO

International Classification:

B32B 27/32
B32B 37/12
B32B 37/14

US Classification:

428220, 156325, 15624424, 428519

Abstract:

A bonded part with a press-fit, vulcanized rubber member residing in compression between two rigid members and bonded thereto. The rubber member is a laminate with a core layer sandwiched between and bonded to two self-bonding rubber layers. The bonded part may be, for example, a vibration damper, isolator or absorber. The core layer and the self-bonding layers may have the same primary elastomer and cure system type, and the self-bonding layers have an adhesion promoter not present in the core layer. The adhesive layers may be from 0.05 to 1 mm thick or from 5% to 10% of the laminate thickness.The method includes forming a rubber core layer, curing it, applying a rubber adhesive layer on each side to form a laminate, inserting the laminate between two rigid members under compression, and post-curing to form a bonded part. The adhesive layers may be partially cured before inserting.

US Patent:

20150290918, Oct 15, 2015

Filed:

Jun 24, 2015

Appl. No.:

14/749181

Inventors:

- Denver CO, US
Lin Zhu - Rochester Hills MI, US
Yahya Hodjat - Oxford MI, US
Paul N. Dunlap - Parker CO, US

International Classification:

B32B 37/24
C08J 3/24
B32B 38/00
B32B 37/15
B32B 37/12
B32B 37/10
C08J 5/12
B32B 37/18

Abstract:

A method of forming a bonded part with a press-fit, vulcanized rubber member residing in compression between two rigid members and bonded thereto. The rubber member is a laminate with a core layer between two self-bonding rubber layers. The bonded part may be, for example, a vibration damper, isolator or absorber. The core layer and the self-bonding layers may have the same primary elastomer and cure system type, and the self-bonding layers have an adhesion promoter not present in the core layer. The adhesive layers may be from 0.05 to 1 mm thick or from 5% to 10% of the laminate thickness.The method includes forming a rubber core layer, curing it, applying a rubber adhesive layer on each side to form a laminate, inserting the laminate between two rigid members under compression, and post-curing to form a bonded part. The adhesive layers may be partially cured before inserting.