EP0362872A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Polybutylene terephthalate moulding compositions with an improved flowability
Assignee: Sumitomo Wiring Systems Ltd
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Filing: 1989-10-06
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Granted: —
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Expires: 2009-10-06
Abstract
Abstract Thermoplastic polyester compositions comprising at least two groups of polybutylene terephthalate with substantially different intrinsic viscosity values and conventional additives for moulding are disclosed. The polymer compositions show an improved thermal flow capability under moulding conditions expressed in such indeces as heat flow(m cal/sec), enthalpy change ΔHm(Joule/gr) at the solidification of fused polymer, crystalline fraction (Xc), the time of growth t ₀ (sec) of the primary nuclei of embryonic crystalline. The polymer compositions of the present application results in a larger size of crystalline than the case of independent, single polymer and this enables to carry out injection moulding at about 20 degrees lower cylinder temperature than usual moulding practice without sacrifying mechanical and thermal properties of the product.
Inventors
- 👤 Onishi Yasuhiko
- 👤 Kubo Yoshinobu
- 👤 Nozaki Takao
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-05 15:34
CPC Classifications
H; H01; H01B; H01B3/00; H01B3/18; H01B3/30; H01B3/42; H01B3/421; H01B3/422; C; C08; C08K; C08K5/00; C08K5/04; C08K5/09; C08K5/098; C08L; C08L67/00; C08L67/02
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
37 words
Polybutylene terephthate moulding composition consisting of at least two polybutylene terephthalate resins with substantially different molar distributions expressed by intrinsic viscosity, releasing agent for moulded products out of metal mould, heat stabilizer and with or without filler.
Claim 2
Dependent Claim
37 words
Polybutylene terephthate moulding composition consisting of at least two polybutylene terephthalate resins with substantially different molar distributions expressed by intrinsic viscosity, releasing agent for moulded products out of metal mould, heat stabilizer and with or without filler.
Claim 3
Dependent Claim
65 words
Polybutylene terephthate moulding composition of claim 1 wherein the polybutylene terephthalate resins are selected from two polymer groups[A], [B] having intrinsic viscosity values [η A ] and [η B ]respectively defined as 0.70 < [η A ] <0.92, 0.93 < [η B ] <1.40 in (dl/gr) unit when measured at 30°C in a mixture of tetrachlorethane 60 and phenol 40 both in parts by weight.
Claim 4
Dependent Claim
33 words
Polybutylene terephthate moulding composition of claim 2 wherein the composition consists of the group[A] polybutylene terephthate resins not less than about five(5) parts by weight and not more than 95 parts by weight.
Claim 5
Dependent Claim
36 words
Polybutylene terephthate moulding composition of claim 1 wherein the moulded product has a spherulite crytalline structure ranging from not less than about three (3) nano meters to not more than ten (10) nano meters in size.
Claim 6
Dependent Claim
23 words
Polybutylene terephthate moulding composition of claim 1 wherein time for crytallization is about one third of induction time for development of embryonic crystalline.
Claim 7
Dependent Claim
39 words
Polybutylene terephthate moulding composition of claim 1 wherein ratio of weight average molecular weight Mw and number average molecular weight Mn is about two(2) after the polybutylene terephthalate resins are brought into molten stage and are homogeneously blended together.
Claim 8
Dependent Claim
30 words
Polybutylene terephthalate moulding composition of claim 1,2 and 3 wherin the releasing agent is selected from montan acid derivatives including montan acid metal salts, partially esterified montan acid metal salts.
Claim 9
Dependent Claim
23 words
Polybutylene terephthalate moulding composition of claim 1 wherein the metal is selected from these in I, II, and III in the periodic Table.
Claim 10
Dependent Claim
21 words
Polybutylene terephthate moulding composition of claim 1 wherein the releasing agent is contained about 0.3 parts in weight in total composition.
Claim 11
Dependent Claim
45 words
An electrical connector housing made by moulding a polybutylene terephthate moulding composition consisting of at least two polybutylene terephthalate resins with substantially different molar distributions expressed by intrinsic viscosity, releasing agent for moulded products out of metal mould, heat stabilizer and with or without filler.
Claim 12
Dependent Claim
45 words
An electrical connector housing made by moulding a polybutylene terephthate moulding composition consisting of at least two polybutylene terephthalate resins with substantially different molar distributions expressed by intrinsic viscosity, releasing agent for moulded products out of metal mould, heat stabilizer and with or without filler.
Claim 13
Dependent Claim
68 words
An electrical connector housing of claim 10 wherein the polybutylene terephthalate resins are selected from two polymer groups[A]. [B] having intrinsic viscosity values [ η A ] and [η B ] respectively defined as 0.70 < [ η A ] <0.92, 0.93 < [η B ] <1.40 in (dl/gr) unit when measured at 30°C in a mixture of tetrachlorethane 60 and phenol 40 both in parts by weight.
Claim 14
Dependent Claim
33 words
An electrical connector housing of claim 11 wherein the composition consists of the group[A] polybutylene terephthate resins not less than about five(5) parts by weight and not more than 95 parts by weight.
Claim 15
Dependent Claim
28 words
An electrical connector housing of claim 10 wherin spherulite crystallines in the housing are not lest than three (3) nano meters and not more than ten(10) nano meters.
References Cited (Backward Citations)
No citation records indexed.
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