Rajendra D Mehta

US Patent:

48332054, May 23, 1989

Filed:

Feb 18, 1988

Appl. No.:

7/157680

Inventors:

Bernard D. Bauman - Coopersburg PA
Patricia E. Burdick - Whitehall PA
Rajendra K. Mehta - Allentown PA

Assignee:

Air Products and Chemicals, Inc. - Allentown PA

International Classification:

C08L 7500

US Classification:

525123

Abstract:

Ground polymeric elastomer or other polymeric plastic, particularly from recovered scrap, is surface modified by treatment with a gaseous mixture containing a minor amount of fluorine and a larger amount of at leasts one reactive gas in an inert gaseous carrier. By the treatment the ground material is made more compatible for admixture with polyfunctional polymer-forming liquids, thereby obtaining novel composites of controlled physical properties. The other reactive gas is preferably oxygen or one of the gases from the group consisting of: chlorine and SO. sub. 2 with or without added oxygen.

US Patent:

47644052, Aug 16, 1988

Filed:

Jul 22, 1987

Appl. No.:

7/076457

Inventors:

Bernard D. Bauman - Coopersburg PA
Rajendra K. Mehta - Trexlertown PA
Mark A. Williams - Souderton PA

Assignee:

Air Products and Chemicals, Inc. - Allentown PA

International Classification:

B29C 4946
B05D 300
B65D 2302

US Classification:

428 35

Abstract:

The present invention is a method for improving the barrier properties of thermoplastic substrates. A surface of the thermoplastic substrate is contacted with a reactive gas stream having an F. sub. 2 concentration greater than or equivalent to 0. 0001 atm. partial pressure of F. sub. 2 per atm. total pressure and sufficient oxygen such that the F. sub. 2 /O. sub. 2 ratio is less than or equal to about 100, with the remainder being additional reactive and/or non-reactive components. A barrier coating material is applied to the treated surface of the substrate and subsequently undergoes a curing step to form the final product.

US Patent:

47711108, Sep 13, 1988

Filed:

Feb 4, 1986

Appl. No.:

6/825839

Inventors:

Bernard D. Bauman - Coopersburg PA
Patricia E. Burdick - Whitehall PA
Rajendra K. Mehta - Allentown PA

Assignee:

Air Products and Chemicals, Inc. - Allentown PA

International Classification:

C08L 7504
C08F 800

US Classification:

525131

Abstract:

Ground polymer elastomer or other polymeric plastic, particularly from recovered scrap, is surface modified by treatment with a gaseous mixture containing a minor amount of fluorine and a larger amount of at least one reactive gas in an inert gaseous carrier. By the treatment the ground material is made more compatible for admixture with polyfunctional polymer-forming liquids, thereby obtaining novel composites of controlled physical properties. The other reactive gas is preferably oxygen or one of the gases from the group consisting of: chlorine and SO. sub. 2 with or without added oxygen.

US Patent:

46596747, Apr 21, 1987

Filed:

Sep 28, 1983

Appl. No.:

6/536604

Inventors:

Bernard D. Bauman - Coopersburg PA
Rajendra K. Mehta - Allentown PA

Assignee:

Air Products and Chemicals, Inc. - Allentown PA

International Classification:

G01N 1508
G01N 3344

US Classification:

436 5

Abstract:

A method is provided for determining the impermeability of a polymeric article to a fluid by the steps of: (a) allowing a permeant to diffuse through the polymeric article for a preselected period of time, (b) converting permeant, diffusing through the article, to an ion by a chemical reaction and (c) measuring the amount of ion formed quantitatively with an ion-selective electrode. A method is further provided wherein a polymeric article is exposed to a permeant for a fixed period of time; removed from contact with the permeant; exposed to a chemical which will convert permeant, back-diffusing through the polymeric article, to an ion; and quantitatively measuring the amount of thus-formed ion with a ion-specific electrode.