US5554674A — Flame retardant molding thermoplastics

Claim 1

Independent Claim 168 words

A thermoplastic composition containing a halogenated flame retardant absent an antimony containing synergist which comprises: (a) from 20-90 weight percent of a single thermoplastic resin or a heteropolymer thermoplastic resin blend; (b) from 5-65 weight percent of a halogenated flame retardant; and (c) a flame retardant enhancing additive absent an antimony containing synergist consisting essentially from about 5-70 weight percent of a metal acid pyrophosphate of the formula: M.sup.Z.sub.x H.sub.y P.sub.n O.sub.3n+1 wherein M is a metal selected from the group consisting of alkali metals and alkaline earth metals, x is a number from 1 to 12, y is a number from 1 to 12, n is a number from 2 to 10, z is a number from 1 to 5, and the sum of xz+y is equal to n+2, all percentages being based on the weight of the total composition wherein said metal acid pyrophosphate is present in an amount sufficient to enhance the flame retardancy to a VO flame rating under Underwriters Laboratories Test No. 94.

Claim 2

Dependent Claim 168 words

A thermoplastic composition containing a halogenated flame retardant absent an antimony containing synergist which comprises: (a) from 20-90 weight percent of a single thermoplastic resin or a heteropolymer thermoplastic resin blend; (b) from 5-65 weight percent of a halogenated flame retardant; and (c) a flame retardant enhancing additive absent an antimony containing synergist consisting essentially from about 5-70 weight percent of a metal acid pyrophosphate of the formula: M.sup.Z.sub.x H.sub.y P.sub.n O.sub.3n+1 wherein M is a metal selected from the group consisting of alkali metals and alkaline earth metals, x is a number from 1 to 12, y is a number from 1 to 12, n is a number from 2 to 10, z is a number from 1 to 5, and the sum of xz+y is equal to n+2, all percentages being based on the weight of the total composition wherein said metal acid pyrophosphate is present in an amount sufficient to enhance the flame retardancy to a VO flame rating under Underwriters Laboratories Test No. 94.

Claim 3

Dependent Claim 24 words

The composition as defined in claim 1, wherein said single thermoplastic resin or a resin in the heteropolymer resin blend comprises a polyester resin.

Claim 4

Dependent Claim 31 words

The composition as defined in claim 1, wherein the amount of said metal acid pyrophosphate ranges from about 10 weight percent to about 35 weight percent by weight of total composition.

Claim 5

Dependent Claim 27 words

A composition as defined in claim 1, which further comprises from an effective amount to about 40 percent by weight of the total composition of a filler.

Claim 6

Dependent Claim 29 words

A composition as defined in claim 1, which further comprises from an effective amount to about 30 percent by weight of the total composition of a rubbery impact modifier.

Claim 7

Dependent Claim 28 words

A composition as defined in claim 2, which further comprises from an effective amount to about 70 percent by weight of the total composition of a polycarbonate resin.

Claim 8

Dependent Claim 29 words

A composition as defined in claim 1, which further comprises from an effective amount to about 10 percent by weight of the total composition of a. polytetrafluoroethylene anti-drip additive.

Claim 9

Dependent Claim 138 words

A thermoplastic flame retardant composition which comprises: (a) from 20-90 weight percent of a single thermoplastic resin or a heteropolymer thermoplastic resin blend; (b) from an effective amount to about 25 weight percent of an organic phosphate flame retardant; and (c) from about 5-70 weight percent of a metal acid pyrophosphate of the formula: M.sup.Z.sub.x H.sub.y P.sub.n O.sub.3n+1 wherein M is a metal selected from the group consisting of alkali metals and alkaline earth metals, x is a number from 1 to 12, y is a number from 1 to 12, n is a number from 2 to 10, z is a number from 1 to 5, and the sum of xz+y is equal to n+2, all percentages being based on the weight of the total composition, wherein said flame retardant additives consist essentially of (b) and (c).

Claim 10

Dependent Claim 138 words

A thermoplastic flame retardant composition which comprises: (a) from 20-90 weight percent of a single thermoplastic resin or a heteropolymer thermoplastic resin blend; (b) from an effective amount to about 25 weight percent of an organic phosphate flame retardant; and (c) from about 5-70 weight percent of a metal acid pyrophosphate of the formula: M.sup.Z.sub.x H.sub.y P.sub.n O.sub.3n+1 wherein M is a metal selected from the group consisting of alkali metals and alkaline earth metals, x is a number from 1 to 12, y is a number from 1 to 12, n is a number from 2 to 10, z is a number from 1 to 5, and the sum of xz+y is equal to n+2, all percentages being based on the weight of the total composition, wherein said flame retardant additives consist essentially of (b) and (c).

Claim 11

Dependent Claim 14 words

A composition as defined in claim 2, wherein said polyester resin is polyethylene terepthalate.

Claim 12

Dependent Claim 14 words

A composition as defined in claim 2, wherein said polyester resin is polybutylene terephthalate.

Claim 13

Dependent Claim 149 words

A thermoplastic composition containing a halogenated flame retardant absent an antimony containing synergist which comprises: (a) from 20-90 weight percent of a thermoplastic resin; (b) from 5-65 weight percent of a halogenated flame retardant; and (c) from about 12-70 weight percent of a metal acid pyrophosphate of the formula: M.sup.Z.sub.x H.sub.y P.sub.n O.sub.3n+1 wherein M is a metal selected from the group consisting of alkali metals and alkaline earth metals, x is a number from 1 to 12, y is a number from 1 to 12, n is a number from 2 to 10, z is a number from 1 to 5, and the sum of xz+y is equal to n+2, all percentages being based on the weight of the total composition wherein said metal acid pyrophosphate is present in an amount sufficient to enhance the flame retardancy to a VO flame rating under Underwriters Laboratories Test No. 94.

Claim 14

Dependent Claim 149 words

A thermoplastic composition containing a halogenated flame retardant absent an antimony containing synergist which comprises: (a) from 20-90 weight percent of a thermoplastic resin; (b) from 5-65 weight percent of a halogenated flame retardant; and (c) from about 12-70 weight percent of a metal acid pyrophosphate of the formula: M.sup.Z.sub.x H.sub.y P.sub.n O.sub.3n+1 wherein M is a metal selected from the group consisting of alkali metals and alkaline earth metals, x is a number from 1 to 12, y is a number from 1 to 12, n is a number from 2 to 10, z is a number from 1 to 5, and the sum of xz+y is equal to n+2, all percentages being based on the weight of the total composition wherein said metal acid pyrophosphate is present in an amount sufficient to enhance the flame retardancy to a VO flame rating under Underwriters Laboratories Test No. 94.

Claim 15

Dependent Claim 15 words

The composition as defined in claim 11, wherein said thermoplastic resin comprises a polyester resin.

Claim 16

Dependent Claim 32 words

The composition as defined in claim 1, wherein the amount of said metal acid pyrophosphate ranges from about 15 weight percent to about 35 weight percent by weight of the total composition.

Claim 17

Dependent Claim 29 words

A composition as defined in claim 11, which further comprises from an effective amount to about 30 percent by weight of the total composition of a rubbery impact modifier.

Claim 18

Dependent Claim 28 words

A composition as defined in claim 11, which further comprises from an effective amount to about 70 percent by weight of the total composition of a polycarbonate resin.

Claim 19

Dependent Claim 64 words

A composition as defined in claim 1, consisting essentially of: (a) from 20-65 weight percent of a single thermoplastic resin or a heteropolymer thermoplastic resin blend; (b) from 25-65 weight percent of a brominated aromatic polycarbonate; (c) from 10-45 weight percent of sodium acid pyrophosphate; (d) from 5-45 weight percent of glass fiber; and (e) from 0-5 weight percent of a polytetrafluoroethylene drip inhibitor.

Claim 20

Dependent Claim 56 words

A composition as defined in claim 1, consisting essentially of: (a) from 25-65 weight percent of polybutylene terephthalate; (b) from 25-65 weight percent of a brominated aromatic polycarbonate; (c) from 10-45 weight percent of sodium acid pyrophosphate; (d) from 5-45 weight percent of glass fiber; and (e) from 0-5 weight percent of a polytetrafluoroethylene drip inhibitor.

Claim 21

Dependent Claim 56 words

A composition as defined in claim 1, consisting essentially of: (a) from 25-65 weight percent of polyethylene terephthalate; (b) from 25-65 weight percent of a brominated aromatic polycarbonate; (c) from 10-45 weight percent of sodium acid pyrophosphate; (d) from 5-45 weight percent of glass fiber; and (e) from 0-5 weight percent of a polytetrafluorotethylene drip inhibitor.

Claim 22

Dependent Claim 46 words

A composition as defined in claim 1 consisting essentially of: (a) from 25-70 weight percent of polybutylene terephthalate; (b) from 25-65 weight percent of brominated polycarbonate; (c) from 10-45 weight percent of sodium acid pyrophosphate; and (d) from 0-5 weight percent of a polytetrafluoroethylene drip inhibitor.

Claim 23

Independent Claim 141 words

A method of imparting flame resistance to a polyester resin composition, said method comprising adding to said polyester resin composition an effective amount of a halogenated flame retardant absent an antimony containing synergist and a retardant enhancing additive consisting essentially of metal acid pyrophosphate of the formula: M.sup.Z.sub.x H.sub.y P.sub.n O.sub.3n+1 wherein M is a metal selected from the group consisting of alkali metals and alkaline earth metals, x is a number from 1 to 12, and y is a number in the range of 1 to 12, n is a number from of 2 to 10; z is a number from 1 to 5, and the sum of xz+y is equal to n+2 wherein said metal acid pyrophosphate is present in an amount sufficient to enhance the flame retardancy to a VO flame rating under Underwriters Laboratories Test No. 94.

Claim 24

Independent Claim 141 words

A method of imparting flame resistance to a polyester resin composition, said method comprising adding to said polyester resin composition an effective amount of a halogenated flame retardant absent an antimony containing synergist and a retardant enhancing additive consisting essentially of metal acid pyrophosphate of the formula: M.sup.Z.sub.x H.sub.y P.sub.n O.sub.3n+1 wherein M is a metal selected from the group consisting of alkali metals and alkaline earth metals, x is a number from 1 to 12, and y is a number in the range of 1 to 12, n is a number from of 2 to 10; z is a number from 1 to 5, and the sum of xz+y is equal to n+2 wherein said metal acid pyrophosphate is present in an amount sufficient to enhance the flame retardancy to a VO flame rating under Underwriters Laboratories Test No. 94.

Claim 25

Dependent Claim 51 words

A composition as defined in claim 1, wherein the metal acid pyrophosphate is selected from the group consisting of K 2 H 2 P 2 O 7 , Na 4 P 2 O 7 , KNaH 2 P 2 O 7 and Na 2 H 2 P 2 O 7 .

Claim 26

Dependent Claim 51 words

A composition as defined in claim 11, wherein the metal acid pyrophosphate is selected from the group consisting of K 2 H 2 P 2 O 7 , Na 4 P 2 O 7 , KNaH 2 P 2 O 7 and Na 2 H 2 P 2 O 7 .

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1999-09-10	2000-03-11	2000-09-10	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	2003-09-10	2004-03-11	2004-09-10	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	2007-09-10	2008-03-11	2008-09-10	$7700.00	Window Closed / Lapsed

Flame retardant molding thermoplastics

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