Title: Manufacture of products having high acoustic insulating characteristics

Abstract: The production of composite structural products having high sound-proofing characteristics by impregnating a mat of fibers of substantial length with an organic thermoplastic resin containing an expanding agent, and thereafter heating the treated mat. The resin is partially jelled during the initial stage of heating and the expanding agent is dissociated during the later stage of the heating, which results in a controlled swelling of resin while the resin completes the jelling thereof while the product attains its predetermined density. Upon the cooling of the material it is transformed from a plastic to an elastic state, especially in the direction of thickness of the product.

Do you think this is a good invention? Vote now:

Votes so far: For:(0) Against:(0)
Other info:

Inventors: Proucelle, Bernard Marie Jean (Creil, FR)

Application Number: 271667
Filing Date: 1972-07-14
Publication_date: 1976-09-14
Assignee: Saint-Gobain Industries (Neuilly-Sur-Seine, FR)
Primary Class(es): 156/62.4 156/79, 156/498, 156/499, 264/45.3, 264/DIG60, 428/304.4, 442/391
Other Classes:
US Patent Ref:

2943949	Jul, 1960	Petry	156/78.
2961332	Nov, 1960	Nairn	156/78.
2964799	Dec, 1960	Roggi et al.	156/79.
2972554	Feb, 1961	Muskat et al.	161/159.
3050427	Aug, 1962	Slayter et al.	156/78.
3172072	Mar, 1965	Willy	161/159.
3239365	Mar, 1966	Petry	156/78.
3257252	Jun, 1966	Keel	156/79.
3423273	Jan, 1969	Mazur	156/79.
3433700	Mar, 1969	Migdol et al.	156/79.
3709752	Jan, 1973	Wistozky	156/79.

Other Refs:
Primary Examiner: Bell, James J.
Assistant Examiner:
Attorney: Lebowitz; Samuel