Low VOC (volatile organic compounds), solvent-based CPVC pipe ad

Details Low VOC (volatile organic compounds), solvent-based CPVC pipe ad Low VOC (volatile organic compounds), solvent-based CPVC pipe ad

1994-08-31

1995-11-28

Szekely, Peter A.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Processes of preparing a desired or intentional composition...

524104, 524113, 524233, 524314, 524360, 524361, 524365, 524425, 524445, 524527, 524567, 524569, C08J 932, C08K 534, C08K 515, C08K 520

Patent

active

054708940

ABSTRACT:
A CPVC adhesive for joining CPVC pipes comprises: (a) about 18 to 28 wt % CPVC resin; (b) a high vapor pressure solvent comprising about 15 to 35 wt % tetrahydrofuran and 0 to about 30 wt % methyl ethyl ketone; and (c) a low vapor pressure solvent comprising about 20 to 45 wt % cyclohexanone, 0 to about 30 wt % N-methyl pyrrolidone, and 0 to 10 wt % dibasic esters (a mixture of refined dimethyl esters of adipic, glutaric, and succinic acids). The VOC level of the CPVC adhesive composition of the invention is at or below the allowed maximum value of 450 g/l, yet the adhesive meets or exceeds required performance standards, such as hydrostatic burst strength and hydrostatic sustained pressure test.

REFERENCES:
patent: 3726826 (1973-04-01), Knight
patent: 3765983 (1973-10-01), Putzier
patent: 3917005 (1973-03-01), Knight
patent: 4209437 (1980-01-01), Fischer
patent: 4672084 (1987-06-01), Dierdorf et al.
patent: 4675354 (1987-06-01), Sperling
patent: 4687798 (1987-08-01), King, Sr.
patent: 4910244 (1990-03-01), Dierdorf et al.
patent: 5077331 (1991-12-01), Fahey et al.

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