Method for rendering flexible sheet material non-adherent
AssigneeGeneral Electric Company Silicone Products Department
InventorMaurice E. Grenoble
Life of this patent
Estimating the term…
Abstract
A solventless composition for rendering flexible sheet materials non-adherent to surfaces to which they normally adhere is disclosed. These compositions include a low viscosity vinyl chainstopped polysiloxane or a low viscosity silanol chainstopped polysiloxane with an organohydrogenpolysiloxane and a curing catalyst.
Claims4
A method for rendering flexible sheet materials non-adherent to surfaces which normally adhere thereto, said method comprising applying to said flexible sheet material, an amount of a solventless composition that will render said flexible sheet material non-adherent to surfaces which normally adhere thereto, said solventless composition comprising:
- a. from 5-20 parts by weight of a silanol chainstopped polysiloxane having the formula:
- ##STR4## wherein R is a monovalent hydrocarbon radical, a halogenated monovalent hydrocarbon radical or a cyanoalkyl radical and t has a value which will give a viscosity between 300 and 1,000 cstks. at 25.degree. C;
- b. from 0.1 to 5 parts by weight of an organic hydrogenpolysiloxane of the formula:
- ##EQU4## wherein R is the same as hereinabove defined and a is 0 to 3, b is 0.005 to 2.0 and a plus b is 0.8 to 3.0;
- and a sufficient amount of a dialkyltin catalyst for curing said composition.
A method for rendering flexible sheet materials non-adherent to surfaces which normally adhere thereto said method comprising:
- a. first applying to said flexible sheet material an amount of dialkyltin catalyst for curing a coating composition which comprises:
- i. a silanol chainstopped polysiloxane having the formula ##STR5## wherein R is a monovalent hydrocarbon radical, a halogenated hydrocarbon radical or a cyanoalkyl radical and t has a value which will give a viscosity between 300 and 1000 cstks. at 25.degree. C;
- and
- ii. an organic hydrogenpolysiloxane of the formula ##EQU5## wherein R is the same as hereinabove defined and a is 0 to 3, b is 0.005 to 2.0 and a plus b is 0.8 to 3.0;
- b. applying said coating composition to the catalyzed flexible sheet and;
- c. curing said coating composition.
Dependencies are inferred from the claim text.