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US 4,101,513 AGranted
Catalyst for condensation of hydrolyzable silanes and storage stable compositions thereof
AssigneeMinnesota Mining and Manufacturing Company
InventorsFrederick J. Fox, Richard W. Noren, George E. Krankkala
Life of this patent
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Abstract
Onium catalysts of Group Va, VIa, and VIIa atoms have been found to be radiation activatable catalysts for the hydrolysis of silanes. Anhydrous compositions comprising silanes and the catalyst are storage stable.
Claims44
An anhydrous, storage-stable, polymerizable composition comprising at least one hydrolyzable silane represented by the formula:
- X.sub.m SiR.sub.4-m
- wherein
- X is a hydrolyzable group or hydrogen,
- R is a hydrocarbyl group, and
- m is 2, 3, or 4,
- and an organic aromatic onium ctalyst comprising an aromatic adduct of (1) a diaromatic, triaromatic, or tetraaromatic organoatomic cation of a Group Va, VIa, or VIIa atom and (2) an anion, said onium catalyst being represented by the formula:
- ##STR13## wherein R.sup.2 is an aromatic group at least as electron withdrawing as benzene,
- R.sup.1 is an alkyl or alkenyl group,
- A is a Group Va, VIa, or VIIa atom,
- X is an anion,
- n is a positive whole integer of at least 2 up to the valence of A plus one,
- a is 0 or a positive whole integer up to the valence of A minus one, and
- n plus a is equal to the valence of A plus one
- and wherein at least two of said R.sup.2 groups are bonded to A.
11 more elements
A method for the condensation of silane comprising irradiating a composition comprising:
- (1) a hydrolyzable silane,
- (2) a catalytic amount of H.sub.2 O, and
- (3) an onium catalyst comprising a) a diaromatic, triaromatic, or tetraaromatic organic adduct of an organoatomic cation of a Group Va, VIa, or VIIa atom, and b) an anion,
- said onium catalyst being represented by the formula:
- ##STR20## wherein R.sup.2 is an aromatic group at least as electron withdrawing as benzene,
- R.sup.1 is an alkyl or alkenyl group,
- A is a Group Va, VIa, or VIIa atom,
- X is an anion,
- n is a positive whole integer of at least 2 up to the valence of A plus one,
- a is 0 or a positive whole integer up to the valence of A minus one, and
- n plus a is equal to the valence of A plus one and wherein at least two of said R.sup.2 groups are bonded to A
- with at least a sufficient intensity of radiation to activate the onium catalyst and initiate the condensation reaction.
9 more elements
An anhydrous, storage-stable, polymerizable composition comprising at least one hydrolyzable silane represented by the formula:
- X.sub.m SiR.sub.4-m
- wherein
- X is a hydrolyzable group or hydrogen,
- R is a hydrocarbyl group, and
- m is 2, 3, or 4,
- and an organic aromatic onium catalyst comprising an aromatic adduct of (1) an aromatic organoatomic cation of a Group Va, VIa, or VIIa atom and (2) an anion, with the proviso that when the Group Va, VIa, or VIIa atom is a halogen atom, the organoatomic cation must be at least diaromatic, and wherein aromatic groups atached to said Group Va, VIa, or VIIa atoms are at least as electron withdrawing as benzene.
3 more elements
An anhydrous, storage-stable, polymerizable composition comprising at least one hydrolyzable silane represented by the formula:
- X.sub.m SiR.sub.4-m
- wherein
- X is a hydrolyzable group or hydrogen,
- R is an acryloxy group, and
- m is 3,
- and an organic aromatic onium catalyst comprising an aromatic adduct of (1) a diaromatic, triaromatic, or tetraaromatic organoatomic cation of a Group Va, VIa, or VIIa atom and (2) an anion, said onium catalyst being represented by the formula:
- ##STR25## wherein R.sup.2 is an aromatic group at least as electron withdrawing as benzene,
- R.sup.1 is an alkyl or alkenyl group,
- A is a Group Va, VIa, or VIIa atom,
- X is an anion, n is a positive whole integer of at least 2 up to the valence of A plus one,
- a is 0 or a positive whole integer up to the valence of A minus one, and
- n plus a is equal to the valence of A plus one and wherein at least two of said R.sup.2 groups are bonded to A.
9 more elements
An anhydrous, storage-stable, polymerizable composition comprising at least one hydrolyzable silane represented by the formula:
- X.sub.m SiR.sub.4-m
- wherein
- X is a hydrolyzable group or hydrogen,
- R is a hydrocarbyl group, and
- m is 2, 3, or 4, and a catalyst capable of curing the silane in the presence of water after exposure to radiation, said catalyst consisting essentially of an organic aromatic onium catalyst comprising an aromatic adduct of (1) a diaromatic, triaromatic, or tetraaromatic organoatomic cation of a Group Va, VIa, or VIIa atom and (2) an anion, said onium catalyst being represented by the formula:
- ##STR26## wherein R.sup.2 is an aromatic group at least as electron withdrawing as benzene,
- R.sup. is an alkyl or alkenyl group,
- A is a Group Va, VIa, or VIIa atom,
- X is an anion,
- n is a positive whole integer of at least 2 up to the valence of A plus one,
- a is 0 or a positive whole integer up to the valence of A minus one, and
- n plus a is equal to the valence of A plus one and wherein at least two of said R.sup.2 groups are bonded to A.
9 more elements
Dependencies are inferred from the claim text.