Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...
Patent
1993-07-29
1995-06-06
Szekely, Peter A.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Processes of preparing a desired or intentional composition...
523218, 524113, 524360, 524365, 524567, 524527, C08K 534, C08K 515, C08K 507, C08L 2706
Patent
active
054223881
ABSTRACT:
A PVC adhesive for joining PVC pipes comprises: (a) about 10 to 22 wt % PVC resin and about 2 to 25 wt % acrylic resin, the total of the PVC resin and acrylic resin ranging from about 18 to 35 wt % of said adhesive; (b) a high vapor pressure solvent comprising about 10 to 50 wt % tetrahydrofuran and 0 to about 40 wt % methyl ethyl ketone, with the total high vapor pressure solvent concentration not exceeding a maximum concentration of about 55 wt % of the total adhesive composition; and a low vapor pressure solvent comprising about 10 to 35 wt % cyclohexanone and 0 to about 35 wt % N-methyl pyrrolidone, with the total low vapor pressure solvent concentration at least about 19 wt % of the total adhesive composition. The VOC (volatile organic compound) level of the PVC 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 lap shear strength.
REFERENCES:
patent: T917005 (1973-12-01), Knight
patent: 3765983 (1973-10-01), Putzier
patent: 4067841 (1978-01-01), Aurichio
patent: 4672084 (1987-06-01), Dierdorf et al.
patent: 4675354 (1987-06-01), Sperling
patent: 4687798 (1987-08-01), King, Sr.
patent: 4910179 (1990-03-01), Dierdorf et al.
Brown Mark W.
Patel Naresh D.
IPS Corporation
Szekely Peter A.
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