US4296010A — Resin composition for cationic electrodepositing …

Claim 1

Independent Claim 157 words

A resin composition for cationic electrodepositing paints which has a high throwing power and does not foul a top coated film and is particularly suitable for two-coat finishing, said resin composition comprising the reaction product of [A] a basic polyamino resin containing amino groups and/or hydroxyl groups capable of reacting with isocyanate groups, with [B] a polyisocyanate mixture composed of (i) 40 to 95 mole% of a low-volatile partially blocked aromatic polyisocyanate containing at least two benzene rings having an isocyanate group directly bonded to a nuclear carbon atom, in which substantially all isocyanate groups except one are blocked with an alcohol, (ii) 2.5 to 50 mole% of a low-volatile fully blocked aromatic polyisocyanate containing at least two benzene rings having an isocyanate group directly bonded to a nuclear carbon atom, and (iii) 2.5 to 40 mole% of a difunctional polyisocyanate, the mole percentages being based on the total amount of the polyisocyanates (i), (ii) and (iii).

Claim 2

Dependent Claim 157 words

A resin composition for cationic electrodepositing paints which has a high throwing power and does not foul a top coated film and is particularly suitable for two-coat finishing, said resin composition comprising the reaction product of [A] a basic polyamino resin containing amino groups and/or hydroxyl groups capable of reacting with isocyanate groups, with [B] a polyisocyanate mixture composed of (i) 40 to 95 mole% of a low-volatile partially blocked aromatic polyisocyanate containing at least two benzene rings having an isocyanate group directly bonded to a nuclear carbon atom, in which substantially all isocyanate groups except one are blocked with an alcohol, (ii) 2.5 to 50 mole% of a low-volatile fully blocked aromatic polyisocyanate containing at least two benzene rings having an isocyanate group directly bonded to a nuclear carbon atom, and (iii) 2.5 to 40 mole% of a difunctional polyisocyanate, the mole percentages being based on the total amount of the polyisocyanates (i), (ii) and (iii).

Claim 3

Dependent Claim 32 words

The composition of claim 1 wherein said basic polyamino resin is an adduct formed between a polyglycidyl ether-type epoxy resin and a monoamine or polyamine containing at least one basic amino group.

Claim 4

Dependent Claim 23 words

The composition of claim 1 wherein the basic polyamino resin is the reaction product between an amine/epoxy adduct and a basic polyamide resin.

Claim 5

Dependent Claim 28 words

The composition of claim 1 wherein said basic polyamino resin contains 1 to 10 amino groups and/or 1 to 20 hydroxyl groups per 1000 g of the resin.

Claim 6

Dependent Claim 20 words

The composition of claim 1 wherein the basic polyamino resin has a number average molecular weight of 500 to 10,000.

Claim 7

Dependent Claim 69 words

The composition of claim 1 wherein the aromatic polyisocyanates are selected from the group consisting of compounds of the following formulae ##STR4## wherein R, R' and R" each represent a hydrogen atom, a lower alkyl group, preferably a methyl group, or a lower alkoxy group, preferably a methoxy group, and n is 0 or an integer of 1 to 4, preferably 0 or an integer of 1 or 2.

Claim 8

Dependent Claim 12 words

The composition of claim 1 wherein said aromatic polyisocyanates are 4,4'-diphenylmethane diisocyanate.

Claim 9

Dependent Claim 46 words

The composition of claim 1 wherein said polyisocyanate mixture is composed of (i) 50 to 90 mole% of said low-volatile partially blocked aromatic polyisocyanate, (ii) 5 to 45 mole% of said low-volatile completely blocked aromatic polyisocyanate, and (iii) 5 to 25 mole% of said difunctional polyisocyanate.

Claim 10

Dependent Claim 35 words

The composition of claim 1 wherein said reaction mixture contains blocked isocyanate groups in an amount corresponding to about 1/2 to 1 equivalent time the total amount of the unreacted amino groups and/or hydroxyl groups.

Claim 11

Dependent Claim 157 words

An aqueous bath for cationic electrodeposition, said bath comprising [I] the reaction product of [A] a basic polyamino resin containing amino groups and/or hydroxyl groups capable of reacting with isocyanate groups, with [B] a polyisocyanate mixture composed of (i) 40 to 95 mole% of a low-volatile partially blocked aromatic polyisocyanate containing at least two benzene rings having an isocyanate group directly bonded to a nuclear carbon atom, in which substantially all isocyanate groups except one are blocked with an alcohol, (ii) 2.5 to 50 mole% of a low-volatile fully blocked aromatic polyisocyanate containing at least two benzene rings having an isocyanate group directly bonded to a nuclear carbon atom, and (iii) 2.5 to 40 mole% of a difunctional polyisocyanate, the mole percentages being based on the total amount of the polyisocyanates (i), (ii) and (iii), [II] a water-soluble aqueous inorganic or organic acid as a neutralization agent for said reaction product [I], and [III] an aqueous medium.

Claim 12

Dependent Claim 157 words

An aqueous bath for cationic electrodeposition, said bath comprising [I] the reaction product of [A] a basic polyamino resin containing amino groups and/or hydroxyl groups capable of reacting with isocyanate groups, with [B] a polyisocyanate mixture composed of (i) 40 to 95 mole% of a low-volatile partially blocked aromatic polyisocyanate containing at least two benzene rings having an isocyanate group directly bonded to a nuclear carbon atom, in which substantially all isocyanate groups except one are blocked with an alcohol, (ii) 2.5 to 50 mole% of a low-volatile fully blocked aromatic polyisocyanate containing at least two benzene rings having an isocyanate group directly bonded to a nuclear carbon atom, and (iii) 2.5 to 40 mole% of a difunctional polyisocyanate, the mole percentages being based on the total amount of the polyisocyanates (i), (ii) and (iii), [II] a water-soluble aqueous inorganic or organic acid as a neutralization agent for said reaction product [I], and [III] an aqueous medium.

Claim 13

Dependent Claim 28 words

The aqueous bath of claim 10 which contains 3 to 30% by weight, as solids, of said reaction product [I] based on the weight of the aqueous bath.

Claim 14

Dependent Claim 19 words

The aqueous bath of claim 10 which has a pH in the range of about 3 to about 8.

Claim 15

Dependent Claim 189 words

In a method of electrodeposition coating of an electrically conductive surface serving as a cathode which comprises passing an electric current across said cathode and an anode in contact with an aqueous electrodepositable composition; the improvement wherein said electrodepositable composition comprises [I] the reaction product of [A] a basic polyamino resin containing amino groups and/or hydroxyl groups capable of reacting with isocyanate groups, with [B] a polyisocyanate mixture composed of (i) 40 to 95 mole% of a low-volatile partially blocked aromatic polyisocyanate containing at least two benzene rings having an isocyanate group directly bonded to a nuclear carbon atom, in which substantially all isocyanate groups except one are blocked with an alcohol, (ii) 2.5 to 50 mole% of a low-volatile fully blocked aromatic polyisocyanate containing at least two benzene rings having an isocyanate group directly bonded to a nuclear carbon atom, and (iii) 2.5 to 40 mole% of a difunctional polyisocyanate, the mole percentages being based on the total amount of the polyisocyanates (i), (ii) and (iii), [II] a water-soluble aqueous inorganic or organic acid as a neutralization agent for said reaction product [I], and [III] an aqueous medium.

Claim 16

Dependent Claim 189 words

In a method of electrodeposition coating of an electrically conductive surface serving as a cathode which comprises passing an electric current across said cathode and an anode in contact with an aqueous electrodepositable composition; the improvement wherein said electrodepositable composition comprises [I] the reaction product of [A] a basic polyamino resin containing amino groups and/or hydroxyl groups capable of reacting with isocyanate groups, with [B] a polyisocyanate mixture composed of (i) 40 to 95 mole% of a low-volatile partially blocked aromatic polyisocyanate containing at least two benzene rings having an isocyanate group directly bonded to a nuclear carbon atom, in which substantially all isocyanate groups except one are blocked with an alcohol, (ii) 2.5 to 50 mole% of a low-volatile fully blocked aromatic polyisocyanate containing at least two benzene rings having an isocyanate group directly bonded to a nuclear carbon atom, and (iii) 2.5 to 40 mole% of a difunctional polyisocyanate, the mole percentages being based on the total amount of the polyisocyanates (i), (ii) and (iii), [II] a water-soluble aqueous inorganic or organic acid as a neutralization agent for said reaction product [I], and [III] an aqueous medium.

Claim 17

Dependent Claim 28 words

A primer-coated article obtained by the method of claim 13 wherein a subsequent top-coating, which has been coated on the primer, is not discolored or deteriorated, while baking.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1984-10-19	1985-04-20	1985-10-20	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1988-10-19	1989-04-20	1989-10-20	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1992-10-19	1993-04-20	1993-10-20	$7700.00	Window Closed / Lapsed

Resin composition for cationic electrodepositing paints

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