US5466736A — Electrostatic spray paint

Claim 1

Independent Claim 97 words

A paint formulation of pigment, resin and solvent, for electrostatic spraying, based on one of the following resins and having a film-forming solids content, according to the base resin, as follows: ______________________________________ Formulation Solids Resin (by weight) ______________________________________ alkyd 55% to 90% acrylic 20% to 40% nitrocellulose 17.5% to 25% polyurethane 50% to 70% ______________________________________ together with viscosity/resistivity values which in a rectangular plot of resistivity (ohm cm×10 6 ) and viscosity (P) fall within the rectilinear-sided operating envelope defined by the points x/y 0.25×10 6 /0.1, 2×10 6 /8, 32×10 6 /4 and 35×10 6 /0.1.

Claim 2

Dependent Claim 97 words

A paint formulation of pigment, resin and solvent, for electrostatic spraying, based on one of the following resins and having a film-forming solids content, according to the base resin, as follows: ______________________________________ Formulation Solids Resin (by weight) ______________________________________ alkyd 55% to 90% acrylic 20% to 40% nitrocellulose 17.5% to 25% polyurethane 50% to 70% ______________________________________ together with viscosity/resistivity values which in a rectangular plot of resistivity (ohm cm×10 6 ) and viscosity (P) fall within the rectilinear-sided operating envelope defined by the points x/y 0.25×10 6 /0.1, 2×10 6 /8, 32×10 6 /4 and 35×10 6 /0.1.

Claim 3

Dependent Claim 34 words

The formulation of claim 1 with the following relation of the resins and the solids content: ______________________________________ alkyd 55 to 75% acrylic 25 to 35% nitrocellulose 17.5 to 22.5% polyurethane 50 to 60% ______________________________________

Claim 4

Dependent Claim 29 words

The formulation of claim 1 when for use in electrostatic spraying, at from 1 to 15 ml/min, and with resulting gloss of over 70, as defined by ASTM D523,60°.

Claim 5

Dependent Claim 22 words

The formulation as claimed in claim 3 wherein the application rate is 1.5 to 10 g/s/cm 2 ×10 -5 dry paint film.

Claim 6

Dependent Claim 22 words

A method of spray painting wherein electrostatic spraying is employed and a paint formulation as set out in claim 1 is used.

Claim 7

Dependent Claim 33 words

The formulation of claim 1 wherein the viscosity/resistivity values fall within a rectilinear-sided operating envelope defined by the points x/y 0.25×10 6 /0.25, 2×10 6 /8, 32×10 6 /0.25 and 35×10 6 /0.25.

Claim 8

Dependent Claim 22 words

A formulation as claimed in claim 4 wherein the application rate is 1.7 to 8.4 g/s/cm 2 ×10 -5 dry paint film.

Claim 9

Independent Claim 138 words

A method of spray painting comprising the steps of forming a spray cloud by the application of a high electric potential to a liquid paint formulation at a paint-supply head thereby breaking said paint up into charged droplets by electrostatic forces, and spraying the charged droplets whereby the droplets are attracted to a work to be painted to form a film, the liquid paint formulation having a film-forming solids content by weight, according to the resin system, selected from: ______________________________________ alkyd 55% to 90% acrylic 20% to 40% nitrocellulose 17.5% to 25% polyurethane 50% to 70% ______________________________________ and viscosity/resistivity values which in a rectangular plot of resistivity (ohm cm×10 6 ) and viscosity (P) fall within the rectilinear-sided operating envelope defined by the points x/y 0.25×10 6 /0.1, 2×10 6 /8, 32×10 6 /4 and 35×10 6 /0.1.

Claim 10

Independent Claim 138 words

A method of spray painting comprising the steps of forming a spray cloud by the application of a high electric potential to a liquid paint formulation at a paint-supply head thereby breaking said paint up into charged droplets by electrostatic forces, and spraying the charged droplets whereby the droplets are attracted to a work to be painted to form a film, the liquid paint formulation having a film-forming solids content by weight, according to the resin system, selected from: ______________________________________ alkyd 55% to 90% acrylic 20% to 40% nitrocellulose 17.5% to 25% polyurethane 50% to 70% ______________________________________ and viscosity/resistivity values which in a rectangular plot of resistivity (ohm cm×10 6 ) and viscosity (P) fall within the rectilinear-sided operating envelope defined by the points x/y 0.25×10 6 /0.1, 2×10 6 /8, 32×10 6 /4 and 35×10 6 /0.1.

Claim 11

Dependent Claim 29 words

The method of claim 8 wherein the film-forming solid contents are: ______________________________________ alkyd 55% to 75% acrylic 20% to 35% nitrocellulose 17.5% to 22.5% polyurethane 50% to 60%. ______________________________________

Claim 12

Dependent Claim 28 words

The method of claim 8 wherein the liquid paint formulation has x/y viscosity/resistivity values of 0.25×10 6 /0.25, 2×10 6 /8, 32×10 6 /4 and 35×10 6 /0.25.

Claim 13

Dependent Claim 33 words

The method of claim 8 wherein the spraying step is carried out at from 1 to 15 ml/min, resulting in a dry paint film gloss of over 70 as defined by ASTM D523,60.

Claim 14

Dependent Claim 30 words

The method of claim 11 wherein the spraying step is carried out at from 1 to 6 ml/min and the gloss of the resultant dry paint film is over 80.

Claim 15

Dependent Claim 20 words

The method of claim 8 wherein the application rate is 1.5 to 10 g/s/cm 2 ×10 -5 dry paint film.

Claim 16

Dependent Claim 20 words

The method of claim 13 wherein the application rate is 1.7 to 8.4 g/s/cm 2 ×10 -5 dry paint film.

Claim 17

Dependent Claim 96 words

An electrostatically sprayable paint formulation of pigment, resin and solvent based on one of the following resins and having a film-forming solids content, according to the base resin, as follows: ______________________________________ Formulation Solids Resin (by weight) ______________________________________ alkyd 55% to 90% acrylic 20% to 40% nitrocellulose 17.5% ot 25% polyurethane 50% to 70% ______________________________________ together with viscosity/resistivity values which in a rectangular plot of resistivity (ohm cm×10 6 ) and viscosity (P) fall within the rectilinear-sided operating envelope defined by the points x/y 0.25×10 6 /0.1, 2×10 6 /8, 32×10 6 /4 and 35×10 6 /0.1.

Claim 18

Dependent Claim 96 words

An electrostatically sprayable paint formulation of pigment, resin and solvent based on one of the following resins and having a film-forming solids content, according to the base resin, as follows: ______________________________________ Formulation Solids Resin (by weight) ______________________________________ alkyd 55% to 90% acrylic 20% to 40% nitrocellulose 17.5% ot 25% polyurethane 50% to 70% ______________________________________ together with viscosity/resistivity values which in a rectangular plot of resistivity (ohm cm×10 6 ) and viscosity (P) fall within the rectilinear-sided operating envelope defined by the points x/y 0.25×10 6 /0.1, 2×10 6 /8, 32×10 6 /4 and 35×10 6 /0.1.

Claim 19

Dependent Claim 36 words

The electrically sprayable formulation of claim 15 with the following relation of the resins and the solids content: ______________________________________ alkyd 55% to 75% acrylic 20% to 35% nitrocellulose 17.5% to 22.5% polyurethane 50% to 60%. ______________________________________

Claim 20

Dependent Claim 30 words

The electrically sprayable formulation of claim 15 for use in electrostatic spraying, at from 1 to 15 ml/min, and with resulting gloss of over 70 as defined by ASTM D523,60°.

Claim 21

Dependent Claim 24 words

The electrically sprayable formulation as claimed in claim 11 wherein the application rate is 1.5 to 10 g/s/cm 2 ×10 -5 dry paint film.

Claim 22

Dependent Claim 40 words

The electrically sprayable formulation as claimed in claim 15 wherein the viscosity/resistivity values fall within a rectilinear-sided operated envelope defined by the points x/y viscosity/resistivity values of 0.25×10 6 /0.25, 2×10 6 /8, 32×10 6 /4 and 35×10 6 /0.25.

Claim 23

Dependent Claim 22 words

A formulation as claimed in claim 18 wherein the application rate is 1.7 to 8.4 g/s/cm 2 ×10 -5 dry paint film.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1998-11-13	1999-05-15	1999-11-14	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	2002-11-13	2003-05-15	2003-11-14	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	2006-11-13	2007-05-15	2007-11-14	$7700.00	Window Closed / Lapsed

Electrostatic spray paint

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