POLYCHLOROPRENE-BASED BONDING ADHESIVES
An adhesive composition comprising a solids component, said solids component including a rubber component that includes polychloroprene; and a solvent component, said solvent component including t-butyl acetate.
1 . An adhesive composition comprising:
i. a solids component, said solids component including a rubber component that includes polychloroprene, where the solids component includes at least 20 parts by weight thermosetting resin per 100 parts by weight rubber, and where the rubber component includes at least 70% by weight polychloroprene; and
ii. a solvent component, where the solvent component includes at least 150 parts and less than 500 parts by weight t-butyl acetate, and at least 30 parts and less than 50 parts by weight toluene per 100 parts by weight rubber.
2 . The composition of claim 1 , where the rubber component further includes poly-(styrene-co-butadiene).
3 . The composition of claim 1 , where the rubber component is devoid of a complementary rubber, and where the solids component includes an adhesion promoter.
4 . An adhesive composition comprising:
i. a solids component, said solids component including a rubber component, a synthetic thermosetting resin, and a hydrocarbon resin, where the rubber component includes at least 70% by weight polychloroprene; and
ii. a solvent component, said solvent component including at least 150 parts and less than 500 parts by weight t-butyl acetate, and at least 30 parts and less than 50 parts by weight toluene per 100 parts by weight rubber.
5 . The adhesive composition of claim 4 , where the rubber component includes at least 70% by weight polychloroprene.
6 . The adhesive composition of claim 1 , where the polychloroprene includes a first polychloroprene characterized by a solution viscosity of from 70 to 215 mPa·s and a second polychloroprene characterized by a solution viscosity of from about 700 to about 1,000 MPa·s.
7 . The adhesive composition of claim 6 , where the solids component includes at least 20 parts by weight thermosetting resin per 100 parts by weight rubber.
8 . The adhesive composition of claim 7 , where the solids component includes at least 10 parts by weight hydrocarbon resin per 100 parts by weight rubber.
9 . The adhesive composition of claim 8 , where the solids component further includes at least 1 part by weight magnesium oxide per 100 parts by weight rubber.
10 . The adhesive composition of claim 9 , where the solids component includes at least 0.5 parts by weight zinc oxide per 100 parts by weight rubber.
11 . The adhesive composition of claim 10 , where the solids component includes at least 0.1 parts by weight antioxidant per 100 parts by weight rubber.
12 . The adhesive composition of claim 11 , where the solids component includes at least 0.5 parts by weight adhesion promoter per 100 parts by weight rubber.
13 . The adhesive composition of claim 12 , where the adhesion promoter is chlorinated polypropylene.
14 . A method of contact bonding a roofing membrane to a substrate, the method comprising:
i. applying a contact adhesive composition to a portion of a roofing membrane panel to form a wet film on the membrane panel;
ii. applying a contact adhesive composition to at least a portion of a substrate to form a wet film on the substrate;
iii. allowing the wet film on the membrane and the wet film on the substrate to set up for desirable contact bonding; and
iv. mating the membrane to the substrate, where the adhesive composition includes
a. a solids component, said solids component including a rubber component, a synthetic thermosetting resin, and a hydrocarbon resin, where the rubber component includes polychloroprene; and
b. a solvent component, said solvent component including at least 150 parts and less than 500 parts by weight t-butyl acetate and at least 30 parts and less than 50 parts by weight toluene per 100 parts by weight rubber.
15 . The adhesive composition of claim 2 , where said solvent component includes at least 250 parts by weight and less than 500 parts by weight t-butyl acetate and at least 33 parts by weight and less than 50 parts by weight toluene per 100 parts by weight rubber.
16 . The adhesive composition of claim 15 , where said solvent component includes at least 285 parts by weight t-butyl acetate and at least 35 parts by weight toluene per 100 parts by weight rubber.
17 . The adhesive composition of claim 16 , where said solvent component includes at least 15 parts by weight methyl acetate per 100 parts by weight rubber.
18 . The adhesive composition of claim 4 , where said solvent component includes at least 250 parts by weight and less than 500 parts by weight t-butyl acetate and at least 33 parts by weight and less than 50 parts by weight toluene per 100 parts by weight rubber.
19 . The adhesive composition of claim 18 , where said solvent component includes at least 285 parts by weight t-butyl acetate and at least 35 parts by weight toluene per 100 parts by weight rubber.
20 . The adhesive composition of claim 19 , where said solvent component includes at least 15 parts by weight methyl acetate per 100 parts by weight rubber.
21 . The composition of claim 4 , where the rubber component further includes poly-(styrene-co-butadiene).
22 . The composition of claim 14 , where the rubber component further includes poly-(styrene-co-butadiene).
23 . The adhesive composition of claim 14 , where said solvent component includes at least 250 parts by weight and less than 500 parts by weight t-butyl acetate and at least 33 parts by weight and less than 50 parts by weight toluene per 100 parts by weight rubber.
24 . The adhesive composition of claim 23 , where said solvent component includes at least 285 parts by weight t-butyl acetate and at least 35 parts by weight toluene per 100 parts by weight rubber.
25 . The adhesive composition of claim 24 , where said solvent component includes at least 15 parts by weight methyl acetate per 100 parts by weight rubber.