Radiation stress relieving of sulfone polymer articles

Details Radiation stress relieving of sulfone polymer articles Radiation stress relieving of sulfone polymer articles

B - Operations, Transporting

29

C

204/91.79

B29C 71/04 (2006.01) B29C 71/02 (2006.01) H05K 3/00 (2006.01) B29C 35/08 (2006.01)

Patent

CA 1189019

UNITED STATES PATENT APPLICATION Of: David C. Frisch and Wilhelm Weber For: RADIATION STRESS RELIEVING OF SULFONE POLYMER ARTICLES ABSTRACT OF THE DISCLOSURE A method of rapidly relieving stress in an article comprised of a sulfone polymer is disclosed. The method can be used in the preparation of printed circuit boards. An article comprised of a sulfone polymer is exposed to electromagnetic radiation, for a time period sufficient to absorb enough energy to stress relieve the sulfone polymer against stress cracking therein. Exposure occurs at one or more ranges of frequencies which are capable of being absorbed by the sulfone polymer and which are effective for stress relieving without or substantially without causing heat induced softening or flowing of the sulfone polymer. The electromagnetic radiation is selected from the ranges of infrared, microwave and ultraviolet radiation. S P E C I F I C A T I O N

388614

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