Polyurethane adhesives for reverse osmosis modules
AssigneeElantas PDG, Inc.
InventorsGordon Kahle, Richard D. Jordan, Jr.
Life of this patent
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Abstract
An adhesive composition suitable for reverse osmosis modules, the adhesive composition includes (I) a polyurethane composition that includes (A) an isocyanate group-containing pre-polymer comprising a reaction product of (i) castor oil or a derivative thereof; and (ii) a polyisocyanate; and (iii) optionally a second polyol; and (B) an isocyanate-reactive polyol mixture comprising: (i) a polybutadiene polyol; and (ii) a urethane catalyst; and (iii) optionally the second polyol; and (II) a plasticizer wherein the adhesive composition is essentially free from diluent oils and solvents.
Claims26
An adhesive composition suitable for reverse osmosis modules, the adhesive composition comprising:
- (I) from 65 wt. % to 99 wt. % of a polyurethane composition based on a total wt. % of the adhesive composition, the polyurethane composition comprising:
- (A) an isocyanate group-containing pre-polymer comprising a reaction product of (i) castor oil or a derivative thereof;
- and (ii) a polyisocyanate;
- and (iii) optionally a second polyol;
- and
- (B) an isocyanate-reactive polyol mixture comprising:
- (i) a polybutadiene polyol;
- and (ii) a urethane catalyst;
- and (iii) optionally the second polyol;
- and
- (II) from 1 wt. % to about 35 wt. % of a plasticizer based on the total wt. % of the adhesive composition,
- wherein the adhesive composition is essentially free from diluent oils and solvents;
- wherein the viscosity of part (B) is at least 1,000 cps;
- and
- wherein the adhesive composition has a Shore hardness of greater than 20 A when fully cured.
An adhesive composition suitable for reverse osmosis modules, the adhesive composition comprising:
- (I) from 65 wt % to 99 wt % of a polyurethane composition, based on a total weight of the adhesive composition, the polyurethane composition comprising:
- (A) an isocyanate group-containing pre-polymer comprising a reaction product of (i) castor oil or a derivative thereof;
- and (ii) a polyisocyanate;
- and
- (B) an isocyanate-reactive polyol mixture comprising:
- (i) polybutadiene polyol;
- (ii) a urethane catalyst;
- and (iii) a secondary polyol;
- wherein the viscosity of part (B) is at least 1,000 cps;
- and
- (II) from 1 wt. % to 35 wt. % of a plasticizer, based on the total wt. % of the adhesive composition,
- wherein the adhesive composition is essentially free from diluents oils and solvents;
- wherein a tensile strength of the adhesive composition when fully cured is at least 1,000 psi;
- and
- wherein a Shore hardness of the adhesive composition when fully cured is between about 35 D and about 75 D.
Dependencies are inferred from the claim text.