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1. (WO2019027865) IONOMER INTERLAYER WITH ENHANCED ADHESION PROPERTIES
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I claim:

1. A resin composition comprising an intimate mixture of (i) an ionomer resin and (ii) an adhesion promotor additive, characterized in that:

(a) the ionomer resin is a sodium -neutralized ethylene- a, β-unsaturated carboxylic acid copolymer;

(b) the adhesion promotor additive is a dialkoxysilane compound; and

(c) the dialkoxysilane compound is present in the resin composition in an amount ranging from 50 to 5000 parts per million by weight based on the weight of the ionomer resin.

2. The resin composition of claim 1, characterized in that the dialkoxysilane compound is a liquid at ambient temperature.

3. The resin composition of claim 1 or claim 2, characterized in that the dialkoxysilane compound is substantially evenly distributed within the resin composition.

4. The resin composition of any one of claims 1-3, characterized in that each of the alkoxy groups of the dialkoxysilane compound individually contains from 1 to 3 carbon atoms, and/or in addition to the alkoxy groups the dialkoxysilane compound also contains an active chemical group for bonding into the ionomer resin.

5. The resin composition of claim 4, characterized in that the active chemical group is selected from an amino group and a glycidyl group.

6. The resin composition of claim 1, characterized in that the dialkoxysilane compound is selected from N-P-(aminoethyl)-Y-aminopropylmethyldimethoxysilane and 3 -gly ci doxy propy lmethy 1 di ethoxy sil ane .

7. The resin composition of any one of claims 1-6, wherein the sodium-neutralized ethylene a, -unsaturated carboxylic acid copolymer comprises constituent units derived from ethylene and constituent units derived from an α,β-unsaturated carboxylic acid, in which at least a part of the constituent units derived from the α,β-unsaturated carboxylic acid are neutralized with a counterion, and wherein the counterion consists essentially of sodium cations.

8. The resin composition of claim 8, characterized in that:

(A) the sodium-neutralized ethylene oc^-unsaturated carboxylic acid copolymer is a dipolymer consisting essentially of copolymerized units of:

(i) ethylene, and

(ii) from 10wt% to 30 wt% of at least one α,β-unsaturated carboxylic acid having 3 to 10 carbon atoms,

wherein the weight percentages of the copolymerized units are based on the total weight of the ethylene acid copolymer and the sum of the weight percentages of the copolymerized units is 100 wt%, and wherein at least a portion of carboxylic acid groups of the α,β-unsaturated carboxylic acid are neutralized to form an ionomer comprising carboxylate groups having sodium counterions;

or

(B) the sodium-neutralized ethylene- a, β-unsaturated carboxylic acid copolymer is a terpolymer consisting essentially of copolymerized units of:

(i) ethylene,

(ii) from 10wt% to 30 wt% of at least one α,β-unsaturated carboxylic acid having 3 to 10 carbon atoms,

(iii) from 2 wt% to 15 wt% of at least one α,β-unsaturated carboxylic acid ester having 3 to 10 carbon atoms, and

(iv) optionally a derivative of an α,β-unsaturated carboxylic acid other than (iii) in an amount such that (iii) + (iv) is 15 wt% or less,

wherein the weight percentages of the copolymerized units are based on the total weight of the ethylene acid copolymer and the sum of the weight percentages of the copolymerized units is 100 wt%, and wherein at least a portion of carboxylic acid groups of the α,β-unsaturated carboxylic acid are neutralized to form an ionomer comprising carboxylate groups having sodium counterions.

10. A particulate masterbatch composition comprising (i) particles of an ionomer resin and (ii) an adhesion promotor additive, characterized in that:

(a) the ionomer resin of the ionomer resin particles is a sodium-neutralized ethylene-α,β-unsaturated carboxylic acid copolymer;

(b) the adhesion promotor additive is a dialkoxysilane compound;

(c) the dialkoxysilane compound is present in the masterbatch composition in an amount ranging from 1 to 10 parts by weight based on 100 parts by weight of the ionomer resin; and

(d) the dialkoxysilane compound is predominantly present in the masterbatch composition as imbibed on the surface of the ionomer resin particles.

11. The masterbatch composition of claim 10, characterized in that each of the alkoxy groups of the dialkoxysilane compound individually contains from 1 to 3 carbon atoms, and/or in addition to the alkoxy groups the dialkoxysilane compound also contains an active chemical group for bonding into the ionomer resin.

12. The masterbatch composition of claim 11, characterized in that the active chemical group is selected from an amino group and a glycidyl group.

13. The masterbatch composition of claim 10, characterized in that the dialkoxysilane compound is selected from N-P-(aminoethyl)-Y-aminopropylmethyldimethoxysilane and 3 -gly ci doxy propy lmethy 1 di ethoxy sil ane .

14. The masterbatch composition of any one of claims 10-13, characterized in that the sodium-neutralized ethylene- a, β-unsaturated carboxylic acid copolymer comprises constituent units derived from ethylene and constituent units derived from an α,β-unsaturated carboxylic acid, in which at least a part of the constituent units derived from the α,β-unsaturated carboxylic acid are neutralized with a counterion, and wherein the counterion consists essentially of sodium cations.

15. The masterbatch composition of claim 14, characterized in that:

(A) the sodium-neutralized ethylene oc^-unsaturated carboxylic acid copolymer is a dipolymer consisting essentially of copolymerized units of:

(i) ethylene, and

(ii) from 10wt% to 30 wt% of at least one α,β-unsaturated carboxylic acid having 3 to 10 carbon atoms,

wherein the weight percentages of the copolymerized units are based on the total weight of the ethylene acid copolymer and the sum of the weight percentages of the copolymerized units is 100 wt%, and wherein at least a portion of carboxylic acid groups of the α,β-unsaturated carboxylic acid are neutralized to form an ionomer comprising carboxylate groups having sodium counterion;

or

(B) the sodium-neutralized ethylene- a, β-unsaturated carboxylic acid copolymer is a terpolymer consisting essentially of copolymerized units of:

(i) ethylene,

(ii) from 10 wt% to 30 wt% of at least one α,β-unsaturated carboxylic acid having 3 to 10 carbon atoms,

(iii) from 2 wt% to 15 wt% of at least one α,β-unsaturated carboxylic acid ester having 3 to 10 carbon atoms, and

(iv) optionally a derivative of an α,β-unsaturated carboxylic acid other than (iii) in an amount such that (iii) + (iv) is 15 wt% or less,

wherein the weight percentages of the copolymerized units are based on the total weight of the ethylene acid copolymer and the sum of the weight percentages of the copolymerized units is 100 wt%, and wherein at least a portion of carboxylic acid groups of the α,β-unsaturated carboxylic acid are neutralized to form an ionomer comprising carboxylate groups having sodium counterions.

16. A method of producing a resin composition, said method comprising the steps of:

(A) providing a masterbatch composition as set forth in any one of claims 10-15; and

(B) mixing the masterbatch composition with an amount of a second sodium-neutralized ethylene-a, -unsaturated carboxylic acid copolymer to result in an intimate mixture with a concentration of said dialkoxysilane compound of from 50 to 5000 parts per million by weight based on the total weight of ionomer resin.

17. An interlay er sheet comprising a layer comprising a sodium-neutralized ethylene-α,β-unsaturated carboxylic acid copolymer, characterized in that:

(A) when the interlayer sheet is preconditioned at 34°C and 50% relative humidity, and the layer of the sodium-neutralized ethylene oc^-unsaturated carboxylic acid copolymer is adhered to the air side of a float glass sheet having an air side and a tin side, the peel adhesion of the layer of the sodium-neutralized ethylene- a, β-unsaturated carboxylic acid copolymer adhered to the air side of the float glass sheet is at least about 20 N/cm (measured at 23°C and 50% RH); and/or

(B) when the interlayer sheet is preconditioned at 34°C and 50% relative humidity, and the layer of the sodium-neutralized ethylene oc^-unsaturated carboxylic acid copolymer is adhered to the air side of a float glass sheet having an air side and a tin side, the peel adhesion of the layer of the sodium-neutralized ethylene- a, β-unsaturated carboxylic acid copolymer adhered to the air side of the float glass sheet is at least about 0.5 (under wet-state conditions); and/or

(C) when the interlayer sheet is preconditioned at 34°C and 50% relative humidity, and the layer of the sodium-neutralized ethylene- a, β-unsaturated carboxylic acid copolymer is adhered to a float glass sheet having an air side and a tin side, the peel adhesion of the layer of the sodium-neutralized ethylene a, -unsaturated carboxylic acid copolymer when adhered to the air side of the float glass sheet (i) is greater than about 5 N/cm (measured at 23°C and 50% RH), and (ii) is greater than when adhered to the tin side of the float glass sheet (measured at 23°C and 50% RH).