Method for rendering substrates resistant to abrasion

• US 4,084,021 A
• Filed: 09/19/1975
• Issued: 04/11/1978
• Est. Priority Date: 10/08/1974
• Status: Expired due to Term

• Current Assignee: Minnesota Mining and Manufacturing Co (3M Company)
• Original Assignee: Minnesota Mining and Manufacturing Co (3M Company)
• Inventors: Sandvig, Timothy C.
• Primary Examiner(s): Hoffman, James R.
• Application Number:
  US05/615,025
• Time in Patent Office: 935 Days
• Field of Search: 427/387, 427/44, 427/54, 427/386, 427/387, 427/164, 427/165, 428/447, 428/429, 260/2, 260/46, 260/54
• US Class Current: 427/493
• CPC Class Codes: C08G 77/00 Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule
• CPC Class Codes: C09D 185/00 Coating compositions based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing atoms other than silicon, sulfur, nitrogen, oxygen, and carbon; Coating compositions based on derivatives of such polymers
• CPC Class Codes: C09D 4/00 Coating compositions, e.g. paints, varnishes or lacquers, based on organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond ; Coating compositions, based on monomers of macromolecular compounds of groups C09D183/00 - C09D183/16
• CPC Class Codes: Y10T 428/31507 Of polycarbonate
• CPC Class Codes: Y10T 428/31544 Addition polymer is perhalogenated
• CPC Class Codes: Y10T 428/31612 As silicone, silane or siloxane
• CPC Class Codes: Y10T 428/31663 As siloxane, silicone or silane
• CPC Class Codes: Y10T 428/31935 Ester, halide or nitrile of addition polymer

Abstract

Coatings comprising the reaction product of ambifunctional silanes and organic esters of titanium, aluminum or zirconium are solvent and abrasion resistant and can be readily applied to soft surfaces as a protective coating.

Claims

1. A method for rendering a surface of a substrate resistant to abrasion comprising

(A) applying to said surface of a substrate a composition comprising:

(1) a metal ester selected from

(a) a chelate of an ester of titanium, aluminum or zirconium having at least two ester groups of the formula --OR bonded directly to the metal wherein R is hydrocarbyl of 1 to 18 carbon atoms, or

(b) a polymeric alkyl titanate having the repeating structure ##STR4## and, (2) an ambifunctional reactive silane selected from epoxy-silane, vinyl silane, and methacryloxy-silane, and

(B) curing said composition to an abrasion resistant state.

2. The method of claim 1 wherein said reactive silane comprises an epoxy-silane represented by the formulae:

##STR5## wherein, each R is independently a divalent hydrocarbon radical of less than 20 carbon atoms, or a divalent radical of less than 20 carbon atoms the backbone of which is C atoms which may be interrupted by individual atoms from the group of N, S and O, the O atoms in the form of ether linkages;

m is 1, 2, or 3;

n is 0 or 1; and

R'"'"' is hydrocarbyl of 1 to 18 carbon atoms or a radical of the formula (CH₂ CH₂ O)_k Z in which k is an integer of at least 1, and Z is hydrogen or an aliphatic hydrocarbon radical of less than 10 carbon atoms.

3. The method of claim 1 wherein said reactive silane comprises a methacryloxy silane represented by the formula:

##STR6## wherein R² is an oxyhydrocarbyl group of 1 to 18 carbon atoms, R³ is an alkylene of 1 to 8 carbon atoms, R⁴ is hydrogen or hydrocarbyl of 1 to 8 carbon atoms, and n is 1 or 2.

4. The method of claim 1 wherein the reactive silane comprises a vinyl-silane represented by the formula:

space="preserve" listing-type="equation">(CH.sub.2 = CH--.sub.n Si -- (R.sup.2).sub.4-n

wherein R² is an oxyhydrocarbyl group and n is 1 or 2.

5. The method of claim 1 wherein said substrate is coated with a priming agent prior to the application of said composition.

6. The method of claim 1 where said cure is effected by exposure to ultraviolet radiation, heating, electron-beam irradiation, or combinations thereof.

7. The method of claim 1 wherein said composition further comprises materials copolymerizable with silanes or the epoxy of said epoxy-silane, the methacryloxy of said methacryloxy-silane, or the vinyl of the vinyl-silane.