SOLVENT SYSTEM FOR COLLAPSING FOAMED POLYSTYRENE

WIPO Patent Application WO2002038659

A3

An improved solvent system useful for collapsing foamed polystyrene comprising for every 100 parts by weight of a dibasic organic acid ester selected from the group consisting of dialkyl adipate, dialkyl glutarate, dialkyl succinate and mixtures thereof, wherein said alkyl groups are either identical or different and have from 1 to 12 carbon atoms, at least one cosolvent selected from the group consisting of (i) from 10 to 66.7 parts by weight ethylene glycol, (ii) from 10 to 66.7 parts by weight propylene glycol, (iii) from 17.6 to 42.8 parts by weight propylene carbonate, (iv) from 53.8 to 66.7 parts by weight dimethyl sulfoxide, (v) from 53.8 to 66.7 parts by weight diacetone alcohol, and (vi) from 42.8 to 66.7 parts by weight isopropyl alcohol. Such a solvent system is particular useful is recycling and recovering polystyrene.

JP2974257	INDUSTRIAL APPLICABILITY: A solution of polyamide-imide in γ-butyrolactone, a method for obtaining the solution, and a yarn thus obtained.
JP3617034	Method of thickening lower alcohol
WO/2012/160363	PROCESS

KOB III NICHOLAS EDWARD

PCT/US2001/032366

July 11, 2002

October 18, 2001

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DU PONT (US)

C08J3/09; C08J11/08; (IPC1-7): C08J11/08; C08J3/09

US5929005A	1999-07-27
US5712237A	1998-01-27
US5486305A	1996-01-23
US5629352A	1997-05-13

DATABASE CHEMABS CHEMICAL ABSTRACTS SERVICE, COLUMBUS, OHIO, USA; XP002195932
PATENT ABSTRACTS OF JAPAN vol. 2000, no. 21 3 August 2001 (2001-08-03)
PATENT ABSTRACTS OF JAPAN vol. 2000, no. 16 8 May 2001 (2001-05-08)
PATENT ABSTRACTS OF JAPAN vol. 1999, no. 03 31 March 1999 (1999-03-31)
PATENT ABSTRACTS OF JAPAN vol. 1997, no. 10 31 October 1997 (1997-10-31)

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