Mastic and caulking compositions

Details Mastic and caulking compositions Mastic and caulking compositions

1988-04-29

1991-10-08

Schofer, Joseph L.

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

Synthetic resins

At least one aryl ring which is part of a fused or bridged...

524407, 524414, 524416, 524417, 524420, 524432, 524435, C08K 310

Patent

active

050555111

ABSTRACT:
Permanently flexible and non-tacky coating mastic and caulking compositions having improved heat-age stability contain (a) at least one polymer having a T.sub.g of about -50.degree. C. to about -10.degree. C. and pendant functional groups attached to the polymer backbone and having the formula: ##STR1## in which R.sub.1 is a divalent organic radical at least 3 atoms in length, and X is organoacyl or cyano; (b) a zinc-containing pigment (e.g. zinc oxide); and (c) a polyphosphate anion in an amount effective for increasing the wet adhesion of the compositions, particularly of aged compositions. The mastics and caulks typically have total non-volatile matter concentrations of about 60 to about 90 weight percent of which about 15 to about 75 weight percent comprises the described polymer and about 25 to about 85 weight percent is the zinc-containing pigment and other non-volatile solid matter other than the polymer such as fillers, other pigments, etc. The liquid portion of the mastics and caulks may be a polymer solvent, aqueous polymer dispersant, or other material. The cured compositions exhibit exceptionally good wet adhesion to architectural structural materials, especially to materials having relatively non-adherent surfaces such as foamed polyurethane roof insulation and smooth surfaced elastomers and plastics, even after heat aging.

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D. A. Upson, "Journal of Polymer Science: Polymer Symposium", John Wiley and Sons, Inc., 1985, 72 (pp. 45-54).
CA 106:1216952, Aug. 20, 1986, Showa Derko "Protecting Layer Forming Agents for Paper Processed Surface".

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