Method of forming a roofing composite using silicone rubber composition

• US 4,293,597 A
• Filed: 09/28/1979
• Issued: 10/06/1981
• Est. Priority Date: 12/30/1974
• Status: Expired due to Term

• Current Assignee: General Electric Company
• Original Assignee: General Electric Company
• Inventors: Lampe, Warren R., Bessmer, Stanley J.
• Primary Examiner(s): Beck, Shrive P.
• Application Number:
  US06/080,143
• Time in Patent Office: 739 Days
• Field of Search: 427/186, 427/204, 427/372.2, 260/375 B, 528/15, 528/18, 528/30, 528/34, 528/38, 528/39
• US Class Current: 427/186
• CPC Class Codes: C08G 77/16 to hydroxyl groups
• CPC Class Codes: C08L 2666/44 Silicon-containing compounds
• CPC Class Codes: C08L 83/04 Polysiloxanes
• CPC Class Codes: E04D 7/00 Roof covering exclusively consisting of sealing masses applied in situ; Gravelling of flat roofs

Abstract

A process of forming a roofing composite comprising applying to a roofing substrate a self-bonding room temperature vulcanizable silicone rubber composition comprising a linear organopolysiloxane, a filler, an alkyl silicate or a hydrolyzate product of an alkyl silicate and a nitrogen functional silane of the formula, ##STR1## where R is selected from the class consisting of monovalent hydrocarbon radicals and halogenated monovalent hydrocarbon radicals, Σ is a hydrolyzable group selected from the class consisting of alkoxy, phenoxy, halo, aminodialkylamino, and tertiary hydroperoxy and θ is a saturated, unsaturated or aromatic hydrocarbon residue functionalized by a member selected from the class consisting of amino, carbonyl, carboxy, isocyano, azo, diazo, thio, thia, dithia, isothiocyano, oxo, oxa, halo, ester, nitroso, sulfhydryl, hydrocarbonylamido, sulfonamido and multiples and combinations thereof and wherein a is a whole number that varies from 0 to 2. There may also be included in the above composition a metallic salt of an organo monocarboxylic or dicarboxylic acid.

Claims

1. A process for forming a composite of a silicone rubber composition and a substrate wherein the bond between said silicone rubber composition and said substrate is hydrolytically stable, said process comprising:

(A) applying to a substrate a self-bonding room temperature vulcanizable silicone rubber composition consisting essentially of (a) a linear, fluid organopolysiloxane containing terminal silicon-bonded hydroxy groups and having a viscosity of 500 to 10,000,000 centipoise when measured at 25°

C., the organic groups of the aforesaid organopolysiloxane representing monovalent hydrocarbon radicals;

(b) 5 to 300% by weight of said linear organopolysiloxane of a filler;

(c) from 0.1-10% by weight based on the linear organopolysiloxane of an alkyl silicate selected from the group consisting of (1) a monomeric organosilicate corresponding to the general formula,

space="preserve" listing-type="equation">(R.sup.40 O).sub.3 Si--R.sup.41

where R⁴⁰ is a radical selected from the group consisting of monovalent hydrocarbon radicals and halogenated monovalent hydrocarbon radicals and R⁴¹ is selected from the group consisting of alkyl, haloalkyl, aryl, haloaryl, alkenyl, cycloalkyl, cycloalkenyl, cyanoalkyl, alkoxy and acyloxy radicals, and (2) a liquid partial hydrolysis product of the aforementioned organosilicate monomeric compounds;

(d) from 0.1 to 5% by weight of the linear organopolysiloxane of a catalyst which is a metallic salt of an organic monocarboxylic or dicarboxylic acid in which the metal ion is selected from the group consisting of lead, tin, zirconium, antimony, iron, cadmium, barium, calcium, titanium, bismuth and manganese with the exception of manganese napthenate and calcium stearate and (e) an amount in the range of from 0.5 to 4% by weight based on the linear organopolysiloxane, that is sufficient to form a hydrolytically stable bond with a substrate, of a nitrogen-functional silane of the formula, ##STR46## where R is selected from the group consisting of monovalent hydrocarbon radicals and halogenated monovalent hydrocarbon radicals, Σ

is a hydrolyzable group selected from the group consisting of alkoxy, phenoxy, amino and dialkylamino and θ

is a nitrogen-functional radical which is a saturated, unsaturated or aromatic hydrocarbon residue which in addition to nitrogen-functionality may be functionalized by a radical selected from the group consisting of amino, cyano, thio, oxo, and ester, and multiples and combinations thereof and a is a whole number that varies from 0 to 2, and where there is present 5 to 50% by weight of the total composition of a hydrocarbon solvent and an amount of an oxygenated solvent selected from the group consisting of alcohols, ethers, ketones and esters that will prolong the work life of the composition without retarding the final cure; and

(B) permitting said composition to cure.

2. The process of claim 1 wherein said substrate is a roofing substrate and further comprising applying roofing granules over said composition after said composition is applied to said roofing substrate.

3. The process of claim 1 wherein said substrate is a roofing substrate.

4. The process of claim 3 wherein the substrate is metal.

5. The process of claim 1 wherein the substrate is masonry.

6. The process of claim 1 wherein the substrate is wood.

7. The process of claim 1 wherein the substrate is plastic.

8. The process of claim 1 wherein the amount of oxygenated solvent is from 0.5% to 5% by weight of total composition.