Organosiloxane compositions for abrasion resistant and adhesion promoting protective coatings

Claim 2

Organosiloxane composition for abrasion resistant and adhesion promoting protective coating of soft substrates, consisting of at least a component selected among eachone of the following classes: A) organo-alkoxysilane of general formula (1) in which: X is a divalent radical selected among aryl or alkyl ene radicals of from 1 to 10 carbon atoms; X may be e.g. (-CH 2 ) m - with m ≥ 1 to 10; the radicals represented by R may be selected among monovalent hydrocarbon radicals, or among possibly also halogenated saturated or unsaturated alkyl radi cals and aryl radicals; R I may represent also hydro gen; R I is preferably selected among hydrogen, alkyl radicals of from 1 to 8 carbon atoms, as well as aryl ra dicals, in particular phenyl; the radicals represented by R II are selected among monovalent possibly halogen-substituted hydrocarbon radicals, such as alkyl radicals, alkenyl radicals, cycloalkyl radicals, aryl radicals; for R II are preferably selected radicals consisting of hydrogen and saturated alkyl radicals of from 1 to 8 carbon atoms; in formula (1) of the silane, n may have the value of 0, 1 and 2, preferably of 0 and 1;

Claim 3

Z may be selected among hydrogen, monovalent alkyl radicals or radicals containing a second nitrogen-bearing funcional group, such as a radical selected from the class of aminoradicals: in this case, the representative formula may be expressed by the formula (2): in which X 1 and X 2 may be the same or different, and are selected among all those radicals already defined for X; B) polyoxymethylenes of general formula (3) in which R' and R" are generally alkyls or hydrogen and in which m is generally comprised within the range of from 6 and 100, included; C) monocarboxylic organic acid; and optionally D) inorganic hydroxyacid of general formula (4) in which: M may be boron, silicon, phosphorus, titanium, aluminum, zirconium, tin, antimony and arsenic; m + n may have the value of 3 or 4; R is generally an alkyl of from 1 to 4 carbon atoms, and can be hydrogen, or an acyl radical; obtained by reacting the component (A) with the component (B) under a moisture free inert atmosphere, quenching the reaction so that the viscosity of reaction medium does not increse beyond 30 centipoise and is however increased to more than 5 centipoise when measured ad 27°C, final ly diluting the reaction product of (A) and (B) in a dilut ing bath consisting of a solvent or of a mixture of sol vents containing a monocarboxylic organic acid (component C) and optionally an inorganic acid (component D) dissolv ed therein, so that in the end composition the resulting pH value is-comprised within the range of from 3 to 6.

Claim 4

Z may be selected among hydrogen, monovalent alkyl radicals or radicals containing a second nitrogen-bearing funcional group, such as a radical selected from the class of aminoradicals: in this case, the representative formula may be expressed by the formula (2): in which X 1 and X 2 may be the same or different, and are selected among all those radicals already defined for X; B) polyoxymethylenes of general formula (3) in which R' and R" are generally alkyls or hydrogen and in which m is generally comprised within the range of from 6 and 100, included; C) monocarboxylic organic acid; and optionally D) inorganic hydroxyacid of general formula (4) in which: M may be boron, silicon, phosphorus, titanium, aluminum, zirconium, tin, antimony and arsenic; m + n may have the value of 3 or 4; R is generally an alkyl of from 1 to 4 carbon atoms, and can be hydrogen, or an acyl radical; obtained by reacting the component (A) with the component (B) under a moisture free inert atmosphere, quenching the reaction so that the viscosity of reaction medium does not increse beyond 30 centipoise and is however increased to more than 5 centipoise when measured ad 27°C, final ly diluting the reaction product of (A) and (B) in a dilut ing bath consisting of a solvent or of a mixture of sol vents containing a monocarboxylic organic acid (component C) and optionally an inorganic acid (component D) dissolv ed therein, so that in the end composition the resulting pH value is-comprised within the range of from 3 to 6.

Claim 5

Composition as claimed in claim is characterized in that the component A is preferably selected among 3-aminopropyl-triethoxysilane, aminomethyl-triethoxy-silane, 2-aminoethyl-aminopropyl-trimethoxysilane and 2-aminoethyl-aminopropyl-methyldimethoxysilane.

Claim 6

Composition as claimed in claim 1, characterized in that the component (B) is preferably selected bet ween trioxane and pareformaldehydeo

Claim 7

Compositions as claimed in claim 1, characterized in that the component (C) is preferably selected among hydroxyacids and aldehydic acids and ketonic acids of from 1 to 4 carbon atoms, optionally halogen-substituted.

Claim 8

Compositions as claimed in claim 4, characterized in that the component (C) is preferably selected among fumaric acid, acetic acid, chloroacetic acid, dichloroacetic acid, trichloroacetic acid, fluoroacetic acid, di fluoroacetic acid, trifluoroacetic acid, glyoxylic acid and glycolic acid.

Claim 9

Compositions as claimed in claim 1, characterized in that the component (D) is preferably selected among phosphoric acid, boric acid, silicic acid.

Claim 10

Compositions as claimed in claim 1, characterized in that the molar ratio, as expressed as (B)/N, i.e., as the ratio of component (B) to all nitrogen present, must be comprised between 0,15 and 1,2.

Claim 11

Compositions as claimed in claim 6, characterized in that the molar ratio (B)/N is preferably comprised within the range of from 0,45 to 0,99.

Claim 12

Compositions as claimed in claim 1, characterized in that the reaction between the component (A) and the component (B) takes place in solution within a solvent selected from ethers, aliphatic and cycloaliphatic hydrocarbons, aliphatic alcohols, chlorinated and fluor inated hydrocarbons, esters, amides, alkyl-alkoxysilanes of general formula in which R 1 and R II have the sane meanings as defined for component (A), and alkyl-acyloxysilanes.

Claim 13

Compositions as claimed in claim 1, characterized in that the reaction between the component (A) and the component (B) takes place at temperatures comprised within the range of from 5° to 70°C.

Claim 14

Compositions as claimed in claim 1, characteriz ed in that the reaction between component (A) and component (B) takes place preferably at temperatures comprised within the range of from 12°C to 50°C.

Claim 15

Compositions as claimed in claim 1, characterized in that the reaction between the component (A) and the component (B) takes place for times varying within the range of from 30 minutes to 5 hours.

Claim 16

Compositions as claimed in claim 1, characteriz ed in that the solvent containing the component (C) and optionally the component (D) is preferably selected from ethers, alcohols, aliphatic hydrocarbons and cycloaliphat ic hydrocarbons, fluorinated hydrocarbons, silanes and alkoxysilanes, or blends thereof.

Claim 17

Compositions as claimed in claim 13, characteriz ed in that the solvent is preferably selected from aliphatic alcohols of from 1 to 5 carbon atoms, as e.g. methanol, ethanol, isopropanol and n-butanol and their blends.

Claim 18

Compositions as claimed in claim 1, characteriz ed in that the ratio of all carboxyl acid equivalents to nitrogen atoms, (-COOH)/N, varies within the range of from 0,75 to 2,5.

Claim 19

Compositions as claimed in claim 15, characteriz ed in that the ratio of all carboxyl acid equivalents to nitrogen atoms, (-COON)/N, preferably varies within the range of from 1,2 to 2.

Claim 20

Compositions as claimed in claim 1 9 characterized in that the component (D) is present in such a quantity, that the atomic ratio between M and all present nitrogen (M/N) is comprised within the range of from 0 to 0, 39 (0≤ M/N ≤ 0,39).

Claim 21

Compositions as claimed in claim 1, characteriz ed in that the soft substrate is selected among aromatic polycarbonates, aliphatic polycarbonates, polyacrylates, polymethacrylates, polyesters, cellulose esters, polyacetals, polyamides, polyvinyl chloride, polysulphones, polyethersulphones, polystyrenes, and copolymers of styr ene with acrylonitrile and acrylonitrile-butadiene.

Claim 22

Compositions as claimed in claim 18, characteriz ed in that the soft substrate is preferably comprised among poly-(diphenyl-2,2'-propane-carbonate), poly-(diethylene glycol-bisallyl-carbonate), polymethylmethacryl ate, poly-(ethylene terephtalate), cellulose acetate, cellulose propanoate, cellulose butanoate.

Claim 23

Items made of soft material, coated by means of a coating consisting of compositions as claimed in claims from 1 to 19 .

Claim 24

Items made of soft material, coated by means of a primer coating consisting of compositions as claimed in claims from 1 to 19.

Claim 25

Items as claimed in claim 21, characterized in that they preferably have the form of plates, films, sheets, of flat shape or of curved shape, and of cellular sheets.

Claim 26

Substantially transparent laminated items consisting of at least a glass sheet and of at least a sheet of soft substrate, bound by means of plasticized thermo plastic adhesives, characterized in that the soft substrate is coated with the compositions as claimed in claims from 1 to 19.

Claim 27

Substantially transparent laminated items, consisting of two or more sheets of soft substrate, bound by means of plasticized thermoplastic adhesives, charac terized in that the soft substrate is coated with the compositions as claimed in claims from 1 to 19;

Claim 28

Substantially transparent laminated items as claimed in claims 23 and 24, characterized in that the plasticized thermoplastic adhesive is preferably plasti cized polyvinylbutyral.

Claim 29

Substantially transparent laminated items, as claimed in claims 23 and 24, characterized in that the soft substrate has preferably the form of a cellular sheet.