Patent GB-762682-A (GB)
Title: Lubricating compositions
Inventor: GARDEN WILLIAM DAVID
Filed: 1954-10-25
Abstract: A lubricating composition comprises at least one liquid polysiloxane and a minor proportion of at least one derivative of orthophosphoric acid wherein one hydrogen atom is replaced by an alkyl aryl group and wherein at least one of the other hydrogen atoms is replaced by a non-unsaturated organo group containing only carbon and hydrogen and having not more than nine hydrogen atoms.  The derivative of phosphoric acid may be methyl hydrogen p-tert.-octylphenyl phosphate, diethyl p-tert.-octylphenyl phosphate, dibutyl p-tert.-octylphenyl phosphate, diphenyl p-tert.-octylphenyl phosphate, diethyl p-tert.-octylcresyl phosphate, diphenyl p-n-decylphenyl phosphate, diethyl p-n-decylphenyl phosphate or diethyl m-isopropylphenyl phosphate. The liquid polysiloxane comprises a chain structure of alternating silicon and oxygen atoms, wherein a preponderant number of the remaining valencies of the silicon atoms are satisfied by alkyl, aryl, alkaryl, aralkyl or halogenoaryl groups, and are prepared by hydrolysis of silanes and condensation; the chains are "end stopped" by eliminating terminal hydroxyl groups by treatment with sulphuric acid and a disiloxane.  The composition preferably contains orthophosphoric acid derivatives in an amount not more than 5 per cent by weight of the polysiloxane.  The composition may include sodium or lithium soaps, silica, asbestos, carbon black or phthalocyanines and antioxidants.  Specifications 585,400, 586,189, 586,956, 603,076, 626,909, 628,072, 653,257 are referred to and Specification 630,911 is referred to in the Provisional Specification.ALSO:A lubricating composition comprises at least one liquid polysiloxane and a minor proportion of at least one derivative of orthophosphoric acid wherein one hydrogen atom is replaced by an alkyl aryl group and wherein at least one of the other hydrogen atoms is replaced by a non-unsaturated organo group containing only carbon and hydrogen and having not more than 9 hydrogen atoms.  The derivative of phosphoric acid may be methyl hydrogen p-tert. octylphenyl phosphate, diethyl p-tert. octyphenyl phosphate, dibutyl p-tert. octylphenyl phosphate, diphenyl p-tert. octylphenyl phosphate, diethyl p-tert. octylcresyl phosphate, diphenyl p-n-decylphenyl phosphate, diethyl p-n-decylphenyl phosphate or diethyl m-isopropylphenyl phosphate. The liquid polysiloxane comprises a chain structure of alternating silicon and oxygen atoms, wherein a preponderant number of the remaining valencies of the silicon atoms are satisfied by alkyl, aryl, alkaryl, aralkyl, or halogenoaryl groups; and are prepared by hydrolysis of silanes and condensation, the chains are "end stopped" by eliminating terminal hydoxyl groups by treatment with sulphuric acid and a disiloxane. The composition preferably contains orthophosphoric acid derivatives in an amount not more than 5 per cent by weight of the polysiloxane. The composition may be made into greases by incorporating sodium or lithium soaps, finely divided silica, asbestos floats, carbon black or phthalocyanines, and may also contain antioxidants. Specifications 585,400, 586,189, 586,956 [all in Group IV], 603,076, 626,909, 628,072, 653,257 [all in Group IV(a)] are referred to and Specification 630,911 [Group IV(a)] is referred to in the Provisional Specification.