Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Reexamination Certificate
1998-12-01
2001-03-20
Short, Patricia A. (Department: 1712)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
C525S444000
Reexamination Certificate
active
06204340
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to thermoplastic resin blends, more specifically to certain visually clear blends of polyetherimide resins and polyester resins.
BACKGROUND
Blends of polyetherimide resins and polyester resins derived predominantly from cyclohexanedimethanol and a carbocyclic dicarboxylic acid, such as, for example, a poly(cyclohexane-dimethanol terephthalate) resin that provide improved impact strength are disclosed in U.S. Pat. No. 5,439,987. Blends of polyetherimide resins and copolyesters of terephthalic acid and/or isoterephthalic acid, 1,4-cyclohexanedimethanol and ethylene glycol, that is, certain poly (cyclohexane-1,4-dimethylene-co-ethylene terephthalate) resins that are said to exhibit a high flexural modulus are disclosed in U.S. Pat. No. 5,439,987.
Polyetherimide blends that exhibit visual clarity, resistance to elevated temperature and further improvements in impact resistance are desired.
SUMMARY OF THE INVENTION
In a first embodiment, the present invention is directed to a visually clear thermoplastic resin composition, comprising a mixture, based on 100 parts by weight (“pbw”) of the thermoplastic resin composition, of:
(a) from 50 to 96 pbw of a polyetherimide resin,
(b) from 2 to 35 pbw of a first polyester resin comprising recurring structural units, wherein each structural unit comprises a diol residue and a diacid residue and wherein from 50 to 100 mole percent (“mol %”) of the structural units of the first polyester resin comprise a divalent alicyclic hydrocarbon radical as the diol residue of the structural unit, said first polyester resin being present in an amount of:
(i) from 2 to 15 pbw, if from 90 to 100 mol % of the structural units of the first polyester resin comprise a divalent alicyclic hydrocarbon radical as the diol residue of the structural unit, or
(ii) from 2 to 35 pbw, if from 50 mol % to less than 90 mol % of the structural units of the first polyester resin comprise a divalent alicyclic hydrocarbon radical as the diol residue of the structural unit, and
(c) from 2 to 48 pbw of a second polyester comprising recurring structural units, wherein each structural unit comprises a diol residue and a diacid residue and wherein from 0 to less than 50 mol % of the structural units of the second polyester resin comprise a divalent alicyclic hydrocarbon radical as the a diol residue of the structural unit,
provided that, if the second polyester comprises structural units wherein the diol residue is a dimethylene radical, then the second polyester does not comprise any structural units wherein the diacid residue is a 2,6-naphthalene dicarboxylate radical and further provided that the polyetherimide resin must be present in an amount greater than 65 pbw if less than or equal to 60 mol % of the structural units of the first polyester comprise a divalent alicyclic radical as the a diol residue of the structural unit.
In a preferred embodiment, the present invention is directed to a thermoplastic resin composition, comprising a mixture, based on 100 pbw of the thermoplastic resin composition, of:
(a) from 50 parts by weight to 96 parts by weight of a polyetherimide resin comprising structural units of the formula:
wherein each R is independently paraphenylene or metaphenylene and T is a divalent radical of the formula:
(b) from 2 to 15 pbw of a poly(cyclohexane-1,4-dimethylene terephthalate) resin, and
(c) from 2 to 48 pbw of one or more second polyester resins selected from copolyester resins, wherein said copolyester resins each comprise recurring structural units, each structural unit comprises a diol residue and a diacid residue, each of the structural units comprises a 1,4-phenylene or 1,3-phenylene radical as the diacid residue of the structural unit and from 50 to 90 mol % of the structural units comprise a dimethylene radical as the diol residue of the unit and from 10 to 50 mol % of the structural units comprise a cyclohexane-1,4-dimethylene radical as the diol residue of the structural unit, and poly(ethylene terephthalate) resins.
In an alternative embodiment, the present invention is directed to a visually clear thermoplastic resin composition, comprising a mixture, based on 100 pbw of the thermoplastic resin composition, of:
(a) from 50 to 96 pbw of a polyetherimide resin,
(b) from 2 to 15 pbw of a first polyester resin comprising recurring structural units, wherein each structural unit comprises a diol residue and a diacid residue and wherein from 90 to 100 mol % of the structural units of the first polyester resin comprise a divalent alicyclic hydrocarbon radical as the diol residue of the structural unit, and
(c) from 2 to 48 pbw of a third polyester comprising recurring structural units, wherein each structural unit comprises a diol residue and a diacid residue and wherein from 0 to less than 90 mol % of the structural units of the third polyester resin comprise a divalent alicyclic hydrocarbon radical as the a diol residue of the structural unit, and provided that, if the third polyester comprises structural units wherein the diol residue is a dimethylene radical, then the third polyester does not comprise any structural units wherein the diacid residue is a 2,6-naphthalene dicarboxylate radical.
The thermoplastic resin composition of the present invention exhibits resistance to elevated temperature, visual clarity and improved impact strength.
DETAILED DESCRIPTION OF THE INVENTION
In a preferred embodiment, the thermoplastic resin composition of the present invention comprises, based on 100 pbw of the thermoplastic resin composition, a mixture of (a) from 60 to 90 pbw, more preferably from 75 to 90 pbw, of the polyetherimide resin, (b)(i) from 2 to 15 pbw, more preferably from 5 to 12 pbw, of the first polyester resin, if from 90 mol % to 100 mol % of the structural units of the first polyester resin comprise a divalent alicyclic hydrocarbon radical as the diol residue of the structural unit or (b)(ii) from 5 to 25 pbw, more preferably from 5 to 20 pbw, of the first polyester resin, if from 50 mol % to less than 90 mol % of the structural units of the first polyester comprise a divalent alicyclic hydrocarbon radical as the diol residue of the structural unit, and (c) from 2 to 35 pbw, more preferably from 2 to 20 pbw, of the second polyester resin.
In an alternative preferred embodiment, the a thermoplastic resin composition of the present invention comprises, based on 100 pbw of the thermoplastic resin composition, a mixture of from 60 to 90 pbw of the polyetherimide resin, from 5 to 12 pbw of the first polyester resin and from 2 to 35 pbw of the third polyester resin.
In a preferred embodiment, the thermoplastic resin composition of the present invention the first and second polyester resins are present in a weight first polyester resin: weight second polyester resin ratio of from 0.5:1 to 1:4, more preferably from 1:1 to 1:3, and still more preferably from 1:1 to 1:2.
In an alternative preferred embodiment, the thermoplastic resin composition of the present invention the first and third polyester resins are present in a weight first polyester resin: weight third polyester resin ratio of from 1:1 to 1:3, more preferably from 1:1 to 1:2.
Polyetherimide Resins
The polyetherimide resins of the composition of the present invention are known compounds whose preparation and properties are described in U.S. Pat. Nos. 3,803,085 and 3,905,942, each of which is incorporated herein by reference.
The PEI used for preparing the blends of this invention comprise more than 1, typically from 10 to 1000 or more, and preferably from about 10 to about 500 structural units, of the formula (I):
wherein T is —O— or a group of the formula —O—Z—O— wherein the divalent bonds of the —O— or the —O—Z—O— group are in the 3,3′, 3,4′, 4,3′, or the 4,4′positions; Z is a divalent radical selected from the group consisting of formulae (II):
wherein X is a member selected from the group consisting of divalent radicals of the formulae (III):
wherein y is an integer from 1 to about 5, and q is 0 or 1; R
Jin Yimin
Liao Jun
Nazareth Darryl
General Electric Company
Short Patricia A.
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