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PriPro Polymers, Inc. 541 Industial Way Fallbrook, CA 92028  PH: 760 473 5577

United States Patent                                                                                             8,003,747

Dewanjee ,   et al.                                                                                                 August 23, 2011

Cross-linked thermoplastic polyurethane/polyurea and method of making same

1. A method of making a cross-linked thermoplastic polyurea comprising the steps of: heating a dry mixture to a temperature within the range of 250.degree. F. to 550 .degree. F. within a mixing barrel to created a heated partially cross-linked mixture, the dry mixture comprising a thermoplastic urethane base material, a di-isocyanate comprising between 1 to 10% of the total weight of the mixture, the di-isocyanate being one of monomeric or polymeric, and a diamine comprising between 1 to 10% of the total weight of the mixture, the diamine selected from the group consisting of 4, 4' methylene-bis-(3-chloro-2, 6-diethylaniline) and 4, 4' methylene-bis-(2, 6-diethylaniline); injecting the heated partially cross-linked mixture into at least one injection mold cavity; and curing the injected material at a temperature between 150.degree. F. to 250.degree. F. for a period of time between 2 and 36 hours.

 

2. The method of claim 1 wherein the di-isocynate comprises 4, 4' diphenylmethane di-isocyanate.

United States Patent                                                                                             7,785,522

Dewanjee ,   et al.                                                                                                 August 31, 2010

Cross-linked thermoplastic polyurethane/polyurea and method of making same

  

We claim as our invention the following:

1. A method for forming a golf ball layer composed of a cross-linked thermoplastic polymer, the method comprising: mixing a thermoplastic urethane based material and a monomeric diisocyanate to create a first mixture, the monomeric diisocynate comprising between 1% to 10% of the total mass of the first mixture; mixing 4,4' methylene-bis-(3-chloro-2,6-diethylaniline) and diethyl 2,4-toluenediamine to create a second mixture, wherein the 4,4' methylene-bis-(3-chloro-2,6-diethylaniline) is 75% to 95% of the total mass of the second mixture and diethyl 2,4-toluenediamine is 25% to 5% of the total mass of the second mixture; heating the first mixture to a temperature within the range of 250.degree. F. to 550.degree. F. to create a heated first mixture; heating the second mixture to a temperature greater than the melting point of the second mixture and less than 225.degree. F. to create a liquid second mixture having a volume; injecting the heated first mixture into a barrel of an injection molding machine through a first opening; injecting the liquid second mixture into the barrel of the injection molding machine in a plurality of dispensing shots of approximately equal amounts of the volume of the liquid second mixture during a predetermined time period; injecting a reaction product into at least one injection mold cavity, the reaction product formed by the reaction of the heated first mixture and the liquid second mixture; and forming a golf ball layer composed of the reaction product.

United States Patent                                                                                                   7,540,990

Dewanjee ,   et al.                                                                                                       June 2, 2009

 

**Please see images for: ( Certificate of Correction ) **

Cross-linked thermoplastic polyurethane/polyurea and method of making same

 

1.  A method for forming an article composed of a cross-linked thermoplastic polymer, the method comprising: mixing a thermoplastic urethane based material and a monomeric diisocyanate to create a first mixture, the monomeric diisocyanate comprising between 1% to 10% of the total mass of the first mixture; mixing 4,4'methylene-bis-(3-chloro-2,6-diethylaniline) and diethyl 2,4-toluenediamine to create a second mixture, wherein the 4,4'methylene-bis-(3-chloro-2,6-diethylaniline) is 75% to 95% of the total mass of the second mixture and diethyl 2,4-toluenediamine is 25% to 5% of the total mass of the second mixture; heating the first mixture to a temperature within the range of 250.degree. F. to 550.degree. F. to create a heated first mixture; heating the second mixture to a temperature greater than the melting point of the second mixture and less than 225.degree. F. to create a liquid second mixture having a volume; injecting the heated first mixture into a barrel of an injection molding machine through a first opening; injecting the liquid second mixture into the barrel of the injection molding machine in a plurality of dispensing shots of approximately equal amounts of the volume of the liquid second mixture during a predetermined time period; injecting a reaction product into at least one injection mold cavity, the reaction product formed by the reaction of the heated first mixture and the liquid second mixture; forming an article composed of the reaction product.

United States Patent                                                                                             7,417,094

Dewanjee ,   et al.                                                                                                 August 26, 2008

Cross-linked thermoplastic polyurethane/polyurea and method of making same

 

1. A cross-linked thermoplastic polyurea comprising a mixture of: a thermoplastic urethane polymer base material; a 4,4'diphenylmethane di-isocyanate comprising between 1 to 10% of the mixture on a total weight basis; a 4,4'methylene-bis-(3-chloro-2,6-diethylaniline) comprising between 1 to 10% of the mixture on a total weight basis; and hydroquinone wherein the range of 1 to 2% of the mixture on a total weight basis.

2. The cross-linked thermoplastic polyurea of claim 1, wherein the 4,4'diphenylmethane di-isocyanate comprises between 1 to 2% of the mixture on a total weight basis.

3. The cross-linked thermoplastic polyurea of claim 1, wherein the 4,4'methylene-bis-(3-chloro-2,6-diethylaniline) comprises between 1 to 2% of the mixture on a total weight basis.

4. A cross-linked thermoplastic polyurethane comprising a mixture of: an aromatic polyether based thermoplastic urethane polymer base material; a 4,4'diphenylmethane di-isocyanate comprising between 1% to 2% of the mixture on a total weight basis; and hydroquinone comprising between 1 to 10% of the mixture on a total weight basis.