Bibliographic data
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`Title:
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`Pub/Pat no:
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`Pub/Issue Date:
`Inventor(s):
`Applicant(s):
`Classification:
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`Application number:
`Priority number:
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`POLYESTER MOLDING COMPOSITION
`
`JPH11279389A
`
`1999-10-12
`CHISHOLM BRET JA|CHISHOLM BRET JA
`GEN ELECTRIC
`C08K3/00AI; CO8G63/64AI; CO8K3/32AI; CO8L67/00AT;
`C08L67/02AT; CO8L69/00AT; CO8L5 1/04 AN
`JP 19990016457 1999-01-26
`US19980014828 1998-01-28;
`
`Abstract of JPH11279389A
`
`PROBLEM TO BE SOLVED: To obtain a thermoplastic resin composition having an increased
`
`glass transition temperature, a relatively high heat distortion temperature, homogenous appearance
`
`and a good melt stability by mixing a specified alkylene naphthanoate polyester with a specified
`amorphous PEC resin and a quencher. SOLUTION: This composition comprises the following
`
`components A to C: [A] about 90 to about 10 wt.% alkylene naphthanoate polyester containing
`
`recurring units of formula I (wherein each R<1> is a divalent aliphatic hydrocarbon,alicyclic
`
`hydrocarbon, polyoxyalkylene group or a mixture thereof; each A<1> is a divalent naphthalene
`group or a mixture thereof), [B] about 10 to about 90 wt.% essentially amorphous polymer
`
`containing recurring units of formula Ht (wherein Ar is a divalent aromatic residue of a
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`dicarboxylic acid or of a mixture thereof; and Ar’ is a divalent aromatic residue of a dihydric
`
`phenolor of a mixture thereof), and [C] a quenchersuch as a phosphite having an acidic OH
`group, an acid phosphate, a phosphorus oxo acid, or a phosphate of a IB or ITB metal in the
`
`periodic table.
`
`

`

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`3. HPPLUIS EASA DE RRL
`#V > PEN/PC/PEC-1=H7 YR.
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`
`

`

`(11)
`
`SHPE 1 1—279389
`
`.
`
`SEY
`PET
`PEN
`
`PCc—3
`PEC—-1
`
`MBS
`
`48. 40
`---
`
`22.94
`22.94
`
`11.00
`
`;
`
`0.73
`
`aHZCIEA
`qetatt
`122
`HDT ; 66psi CC)
`Tt
`HDT ; 264psi (°C)
`5400
`Sl5RoaS (psi )
`32
`SISRAHTS (2%)
`246100
`HTSHEES(psi)
`10400
`HEThe S (psi)
`(gE) * =1 BITS EMAL,
`
`-——-
`48. 40
`
`22.94
`22.94
`
`11.00
`
`0.73
`
`133
`109
`6700
`24
`258300
`11700
`
`
`
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`
`(51) Int.C1.é
`(CO8BL
`
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`67/02
`
`51:04)
`67/02
`
`69:00)
`
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`
`FI
`
`

`

`(12)
`
`RPE 1 1—-279389
`
`C 7b Gel a HA ad
`
`1. Title of Invention
`
`Polyesier Molding Composition
`
`2. Claims
`
`1. A thermopiastc resin composition comprising:
`a) about 90 to about 10 weight percent of an alkylene polyester
`napthanoate containing recurring units of the formula I:
`
`?
`M
`1
`—o-R!-O-C-al—c—
`
`wherein each R! is independently a divalentaliphatic hydrocarbon, alicvelic
`hydrocarbon, , polvoxvaikylene radical, or mixtures thereof and each Al is
`
`independendy a divalent napthalene radical, or mixtures thereof:
`
`b) about 10 to about 90 weigitt percent of an essentially amorphous
`polymer containing recurring wnits of ithe formula I:
`
`i [
`aaC-O-Ar-0O
`é-o-ar-o-}
`
`x
`
`¥
`
`wherein Aris divalent aromatic residue of a dicarboxylic acid or mixture of
`dicarboxylic acids and Ar'is the divalent aromatic residue of a dihydric
`phenol or mixture of dihydric phenols; and
`
`c) a quencherseiected froin the group consisting of phosphites having
`an acidic OH group,acidic phosphatesalts, polyacid pyrophosphaies and
`acidic salts thereof, phosphaies of Group IB and Group IIB metais, and
`phosphorusoxo-acids.
`
`2, A thermoplastic resin composition of claim 1 wherein said
`
`composition further comprises a polycarbonate resin having recurring units
`of formula IT where x = 0.
`
`3. A thermoplastic resin composition of claim 1 wherein Ar’ of
`formula Iis derived from the aromatic residue of bisphenol A as the dihvdric
`
`phenol component.
`4. A thermoplastic resin composition of claim 1 wherein Ar of formula
`Il is derived from the aromatic residue of isophthalic acid . terepitthalic acid
`
`or a mixture thereot.
`
`

`

`(13)
`
`RPE 1 1—-279389
`
`5. A thermoplastic resin composition of claim 1 wherein the polvester
`napthanocate of formula | is a polyalkvlene napthanoate wherein A? is the
`
`residue from a diacid component 2,6-napthancic acid and derivatives thereof
`
`and R! is the residue from a diol componentselected from the group
`
`consisting essentially of ethylene glycol, propanediol, butanediol, or
`
`cyvclohexanedimethanol, and derivatives thereof.
`6. A thermopiastic resin composition of claim 1 wherein said
`composition further comprises a rubbery impact modifier and wherein said impact
`
`modifier is a graft copolymer comprising a rubbery substrate and a rigid
`
`polymeric graft or shell.
`7. A thermoplastic resin composition of claun 6 whereinsaid graft
`copolymeris selected from methyimethacrylate-butadiene-stvrene graft
`copolymers and acrvlonitrile-butadiene-stryene graft copolvmers.
`
`S.A therrmoniastic resin composition of claim 1 wherein polyester
`naphthanoate of formula I comprises fram about 10 to about 90 percent, the
`amorphous PEC resin of formula I] comprises from about 90 io about 10
`percent by weight, said amorphous PEC thermoplastic resin including from 0
`to about 60 percent by weight polycarbonate, from 0 to about 25 percent by
`weight of a rubbery impact modifier, from 0 to about 60 percent by weightof
`a glass or minevalfiller material, and froin about 0.005 to about2.0 weight
`percent of a quencher.
`9A thermoplastic resin composition of claim 1 wherein polvester
`naphthanoate of formula I comprises from abuut 20 to about 60 percent and
`the amorphous PECresin of formula II comprises from about 20 to about 50
`percent by weight wherein said weight percent is based on the total weightof
`said thermoplastic resin.
`
`10, A thermoplastic resin composition of claim 3 wherein said
`composition comprises from about 10 to about 40 percent by weight of a
`polycarbonate resin having recurring units of formula I] where x = 0.
`
`

`

`(14)
`
`RPE 1 1—-279389
`
`3. Detailed Description of Invention
`
`Field of the Invention
`
`The invention relates to blends of polyester resin.
`
`BACKGROUND OF THE INVENTION
`
`Polycarbonate (PC) blends with aromatic crystalline polyesters are well
`knownand are useful for their combination of processability, solveni
`resistance and impact strength. In most cases these blends also give good,
`uniform surface appearance. The thermal properties of these blends,
`especially underload, is a function of the glass transition iemperature (Tg) of
`the polycarbonate-rich phase. To the extent that the polycarbonateis partially
`miscible with the polyester, the PC Tg of the blend will be reduced relative to
`pure PC [ref. |. Applied Polymer Sci. 48, 2249 (1993). This will cause a drop in
`thermal properties like Heat Distortion Under Load (HDT).
`If one tries to address the drop in blend Tg by use of a higher Tg
`polycarbonate resin there maystill be problems. Polyarylates and the related
`polyester carbonate (PEC) resins are known to lave someof the proneriies of
`polycarbonate with higher [gs (see US 4,430,484). lowever, when these
`polyarylates or polyester carbonaies are mixed with standard alkyl
`terephihalate base polyesters, like polybutylene terephthalate (PBT), there is
`little if any gain in HDTvs. the standard, lower Tg PC blends. [he higher Tg
`polvesier carbonates and polyarviates are more miscible with the alkyl
`terephthalate resins and the resultant Tg of the blend is about the same or
`lower than an analogous PC-aikyl terephthalate blend.
`
`

`

`(15)
`
`RPE 1 1—-279389
`
`Another way to irv to address the loss of thermal properties in
`
`polyester-polycarbonate blendsis to use a crvstalline palyester that has a
`
`higher Tg than the standard polyalkylene terephthalates, polyetnylene
`
`terephthalate (PET) and PBT PC [ref. Research Disclosure, Nov. 1987, n667-
`
`969]. Higher Tg crystalline polyesters have recently become commercially
`
`available as alkyl naphthanoate polyester resins like polyethylene
`
`naphthanvate (PEN) or polybutylene nanhihanoate (PBN). Unfortunately,
`
`these naphthanoate polvester resins when vlended with polycarbonate give
`
`inolded parts with poor appearance showing a poorly dispersed, non
`
`uniform, pearlescent surface.
`
`Thus, PC-polyester blends with higher heat capability and good
`
`appearance and good mechanical properties are difficult to achieve. Hence,it
`
`is desired to have a polycarbonate/polyesier blend with a combination of
`
`properties including increased Tg, high impact strength, higner Heat
`
`Distortion Temperature (HDT) as well as uniform appearance.
`SUMMARY OF THE INVENTION
`
`It is well known to those skilled in the art, that the area of modification
`
`of the physical properties of a polymer by the addition of various additives or
`other polymers thereto is largely an empirical art rather than a predictable
`science with little, if any, predictability on the effects a particular additive will
`have ina particular polymer. Surprisingly, we have foundthat blending the
`alkyl naphthanoate polyesters with polyester carbonates give blends which
`solve the issues of appearance and lower [g. Instead of getting the expected
`low Tg blend with poor appearance, the poivalkvlene naphthanoate with
`polyester carbonate resin gives blends with a fine dispersion and excellent
`appearance. In addition, the blends show reduced miscibility compared to a
`standard alkyl terephthalate polyester-polvester carbonate blends and have
`higher Tgs with umproved thermal properties, such as HDT.
`
`

`

`(16)
`
`RPE 1 1—-279389
`
`This specific combination of polyester carbonate or polyarylate resins
`
`with polyalkylene naphthanoate polyesters solves both the problems of
`appearance and thermal properties while still maintaining the benefits of
`solvent resistance, processability, stiffness and impact strength.
`
`It 16 also important to prevent reaction between the polynaphthanoates
`and nolyester carvonates/ polyarylates during melt processing, since such
`reaction will lead to copolymer formation and a degradation of thermal
`properties, as well as the creation of color and undesirable processing effects
`such as gas generation. Use of specific acidic phosphorus species is desirable
`to prevent melt reaction of the blended polymers.
`In accordance wiih the preseat invention, there