EP0754109A1 - Materiau pour noyau moulage et procede de moulage par injection - Google Patents

Materiau pour noyau moulage et procede de moulage par injection

Info

Publication number
EP0754109A1
EP0754109A1 EP95915552A EP95915552A EP0754109A1 EP 0754109 A1 EP0754109 A1 EP 0754109A1 EP 95915552 A EP95915552 A EP 95915552A EP 95915552 A EP95915552 A EP 95915552A EP 0754109 A1 EP0754109 A1 EP 0754109A1
Authority
EP
European Patent Office
Prior art keywords
core material
pva
core
peo
range
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP95915552A
Other languages
German (de)
English (en)
Inventor
Norihito Shibahara
Osamu Sawajiri
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
3M Co
Original Assignee
Minnesota Mining and Manufacturing Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Minnesota Mining and Manufacturing Co filed Critical Minnesota Mining and Manufacturing Co
Publication of EP0754109A1 publication Critical patent/EP0754109A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/40—Removing or ejecting moulded articles
    • B29C45/44—Removing or ejecting moulded articles for undercut articles
    • B29C45/4457—Removing or ejecting moulded articles for undercut articles using fusible, soluble or destructible cores
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C33/00—Moulds or cores; Details thereof or accessories therefor
    • B29C33/44—Moulds or cores; Details thereof or accessories therefor with means for, or specially constructed to facilitate, the removal of articles, e.g. of undercut articles
    • B29C33/52—Moulds or cores; Details thereof or accessories therefor with means for, or specially constructed to facilitate, the removal of articles, e.g. of undercut articles soluble or fusible
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/40—Removing or ejecting moulded articles
    • B29C45/44—Removing or ejecting moulded articles for undercut articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2829/00—Use of polyvinylalcohols, polyvinylethers, polyvinylaldehydes, polyvinylketones or polyvinylketals or derivatives thereof, as mould material
    • B29K2829/04—PVOH, i.e. polyvinyl alcohol
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2871/00—Use of polyethers, e.g. PEEK, i.e. polyether-etherketone or PEK, i.e. polyetherketone or derivatives thereof, as mould material
    • B29K2871/02—Polyalkylene oxides, e.g. PEO, i.e. polyethylene oxide, or derivatives thereof

Definitions

  • the present invention relates to a core material composed of a water soluble material.
  • the core material of the present invention is useful especially for the preparation of a core for the injection molding of plastic products or parts with a fine structure, e.g., a face fastener (Hook-and-Loop fastener) used in the automotive industrial field, and so forth.
  • a face fastener Hook-and-Loop fastener
  • the material for the preparation of core for injection molding of high molecular weight material products or parts with a fine structure it is needed to satisfy the conditions that it is easy to mold a core having a fine structure in itself, and that after said high molecular weight material products or parts have been molded, the used core can be easily dissolved in water and eliminated.
  • U.S. Pat. No. 5,242,646 discloses a process for the production of a face fastener composed of a head portion, stem portion and base, and in this process, PVA is used as a core material.
  • PVA is simultaneously melted and decomposed (thermal crosslinking), difficulty has been attended with the formation itself of a core.
  • a water soluble core material for the injection molding of a high molecular weight material there is described an acrylic high molecular weight material having a carboxyl group in Japanese Unexamined Patent Publication No. 60-155212 and EP 0314156.
  • U.S. Pat. No. 4,990,146 and U.S. Pat. No. 4,870,148 there is described amino group-containing high molecular weight materials soluble in an acid solvent or alkaline solvent.
  • Japanese Unexamined Patent Publication No. 1-198609 there is described, as a water soluble core material, a material obtained by addition of a filler to a carboxyl group- containing acrylic high molecular weight material.
  • these water soluble materials have been defective in the insufficiency of heat resistance and fluidity, in forming a core, or has had the drawback that they are poor in water solubility in the case where a used core is to be eliminated by use of water.
  • the present invention relates to a core material for injection molding, and the purpose of the present invention is to provide a core material, which has sufficient heat resistance and fluidity in forming a core, thereby facilitating precise formation of a core having a minute structure, and which is easily dissolved in water in the case of used core being dissolved in water and eliminated.
  • the present inventors studied in various ways for solving the aforesaid problem, and consequently found that a composition comprising a polyvinyl alcohol (PVA) and polyethylene oxide (PEO) satisfies the aforesaid requirements, so as to achieve the present invention.
  • PVA polyvinyl alcohol
  • PEO polyethylene oxide
  • the present invention provides a core material for injection molding, comprising a copolymer of a polyvinyl alcohol (PVA) and polyethylene oxide (PEO), and the use thereof.
  • PVA polyvinyl alcohol
  • PEO polyethylene oxide
  • PVA polyvinyl alcohol
  • PEO polyethylene oxide
  • a polyvinyl alcohol (PVA) has a melting point ranging from 170°C to 230°C according to the difference of saponification degrees.
  • any PVA begins to be thermally decomposed at a temperature exceeding 200°C, and at a temperature of 240°C or more, dehydration and crosslinking reaction of PVA proceed, and therefore, PVA has the defect that the water solubility thereof becomes noticeably lowered.
  • PVA polyethylene oxide
  • PEO polyethylene oxide
  • PEO is also known as a water soluble resin.
  • PEO is very poor in injection fluidity, as compared with a PVA having a molecular weight in the same degree as that of the PEO, and therefore unsuitable for the production of an injection molded product of a fine shape.
  • the copolymer of a polyvinyl alcohol (PVA) and polyethylene oxide (PEO) is capable of relatively lowering the hydroxyl group concentration causing a chemical reaction. While a high water solubility is maintained, because the copolymer has a hydroxyl group and ether linkage in the structure thereof, and therefore, the copolymer is more stable than a PVA. In addition, the introduction of an ether linkage gives a low melting point to the copolymer, and therefore, can solve the problem related to the thermal workability of PVA.
  • the PVA portion constituting the above copolymer includes the range from a partially saponified PVA having an acetic group to the fully saponified PVA, according to the extent of the saponification degree.
  • the molar ratio between the PVA and PEO in the aforesaid copolymer is preferably within the range of 99 to 50 (PVA): 1 to 50 (PEO). Within this range of ratio, there can be obtained sufficient thermal stability and sufficient fluidity at the time of forming a core, as well as sufficient water solubility of the used core, but, when the proportional amount exceeds 50%, the viscosity of the core becomes so high that it becomes difficult to form a core having a fine shape. On the other hand, when the proportional amount is less than 1%, the thermal stability of the core material is so low that thermal crosslinking occurs owing to the heating during the formation of the core, and the water solubility of the used core is likely to be lowered.
  • the molar ratio between the PVA and PEO in the polymer is more preferably within the range of 95 to 55 (PVA): 5 to 45 (PEO). Within this range, the aforesaid characteristics are emphasized to a greater extent.
  • the molar ratio between the PVA and PEO in the polymer is still more preferably within the range of 90 to 70 (PVA): 30 to 10 (PEO). Within this range, the aforesaid characteristics are emphasized to a still greater extent.
  • the saponification degree of the PVA in preferably 65 mol-% or more, e.g., within the range between 65 and 99 mol-%.
  • the saponification degree of 99 mol-% means the maximum value of the actually available saponification degree.
  • the saponification degree of the PVA is more preferably 70 mol-% or more, e.g., within the range between 70 and 99 mol-%. When the saponification degree is 70 mol-% or more, especially the water solubility of the PVA becomes high.
  • the saponification degree of the PVA is still more preferably 80 mol-% or more, e.g., within the range between 80 and 99 mol-%. When the saponification degree is 80 mol-% or more, the melting point of the PVA increases, while the water solubility thereof is maintained, and the heat resistance of the PVA is improved in the case of parts or the like being injection molded.
  • the preferred embodiment of the water soluble core material of the present invention is one having a T g value ranging from 40°C to 100°C. Because, when the T g value is less than 40°C, the core material is poor in heat resistance, and unsuitable as a core material to be used in a mold for injection molding. On the other hand, when the T g value exceeds 100°C, the injection molding of the core itself becomes difficult, and what is more, water solubility of the core material becomes lowered. Therefore, it becomes difficult to use the core material, especially for an injection molded product having a fine shape.
  • the preferred embodiment of the water soluble core material of the present invention includes a water soluble high molecular weight material in which the MI value of the aforesaid water soluble core material is within the range between 0.1 and 50 (according to ASTM D-1238, at 210°C, under a load of 2160g).
  • the reason why the MI value is limited within the range between 0.1 and 50 in the present invention is that when the MI value is less than 0.1, the fluidity of the core material becomes poor in a mold for injection molding, resulting in the difficulty of the use of the core material, especially for an injection molded product having a fine shape, and on the other hand, when the MI value exceeds 50, the average molecular weight of the core material becomes relatively lower, resulting in lowering of the heat resistance of the core material.
  • PVA PEO copolymer As concrete commercially available PVA PEO copolymer, there may be mentioned water soluble PVA PEO copolymers, "Ax 300", “Ax 2000”, and the like produced by Nihon Gosei Kagaku Kogyo K.K. (Japan Synthetic Chemistry Ind. Co., Ltd.).
  • water soluble PVA PEO copolymers "Ax 300", “Ax 2000”, and the like produced by Nihon Gosei Kagaku Kogyo K.K. (Japan Synthetic Chemistry Ind. Co., Ltd.).
  • oxazoline compound polyethylene oxide (PEO), and/or PVA.
  • An oxazoline compound is defined as a high molecular weight material having an oxazoline skeleton in the molecule, and as an oxazoline compound, there may be used, e.g., poly(2-ethyl-2- oxazoline) and the like.
  • an oxazoline compound, PEO or PVA is herein added is that it thereby becomes possible to improve the fluidity and water solubility of the core material without impairing the heat resistance thereof.
  • PVA there is preferred a one having a hydroxyl group concentration ranging from 70 to 95 mol-%.
  • the reason therefor is that, when the hydroxyl group concentration is less than 70 mol-%, the water solubility of PVA lowers, on one hand, and on the other hand, when the hydroxyl group concentration exceeds 95 mol-%, not only the water solubility of PVA becomes lowered, but also the heat resistance thereof becomes noticeably worsened.
  • the proportional amount of the oxazoline compound, POE or POE to be added is preferably within the range between 5 and 60 parts by weight based on 100 parts by weight of the present water soluble copolymer.
  • a polyhydric alcohol compound such as inorganic matters or metal oxides and coloring pigments.
  • Addition of a small amount of a polyhydric alcohol compound can improve the fluidity of the core resin.
  • a polyhydric alcohol compound since a polyhydric alcohol compound has a hydroxyl group in the molecule, the boiling point thereof is relatively high, and also in the use thereof in a mold of the present invention, there are not caused the problems such as foaming and bleeding.
  • the polyhydric alcohol compound is more effective also because it improves the dispersibility of fillers such as inorganic matters or metal oxides and coloring pigments.
  • a polyhydric alcohol is defined as a compound having at least 2 hydroxyl groups in the molecule, and as a polyvalent alcohol, there can be used, e.g., glycerine, ethylene glycol, trimethylene glycol, tetramethylene glycol, propylene glycol, diethylene glycol, triethylene glycol, 2,3-butanediol, 1,3-butanediol, pentamethylene glycol, and the like.
  • Fillers are effective for the improvement of the heat resistance, mechanical strength, weighting effect (reduction of cost), fluidity, and solubility of the core material of the resent invention, and as the fillers, there can be used e.g., talc, glass beads, hollow glass beads, magnesium carbonate, mica, alumino silicate, calcium phosphate, zeolite, metal salts, as well as oxides of the metals such as titanium, tin, magnesium, and zinc.
  • the amount of the fillers to be added is preferably within the range between 1 and 150 parts by weight based on 100 parts by weight of the aforesaid water soluble core material, in general, although it is not particularly limited. Within a range other than the aforesaid range, the fillers are poor in the aforesaid improving effects. In addition, it is favorable to improve the compatibility of the fillers such as glass beads with the core material by subjecting them to coupling treatment.
  • Pigments or dyes are very effective for recognizing the dissolved state of the core material of the present invention, and in its turn, the adhesion of the core material to an injection molded product such as face fastener, by visual observation or the like. For example, by use of a core color different from the color of the injection molded product, adhesion of the core material to the product can easily be recognized.
  • the kinds of the pigments or dyes to be used are not particularly limited, there can be used, as the pigments or dyes, carbon black, organic pigments, titanium white, and organic dyes such as azo dyes, acid dyes, basic dyes, thiazole dyes, and naphthol dyes.
  • the amount of the pigments or dyes to be added is preferably within the range between 0.01 and 5 parts by weight, based on 100 parts by weight of the water soluble core material.
  • this amount is less than 0.01 part by weight, the aforesaid recognizing effect becomes poor, and on the other hand, when it exceeds 5 parts by weight, on the contrary, the pigments or dyes are adhered to the injection molded product, and time and labor are required to eliminate them, on the contrary.
  • a process for production of a core characterized by melting the present core material at a temperature of at least 50°C, and injection-molding said molten core material into a mold.
  • the reason why the core material is headed to at least 150°C is because by this method a lower melting viscosity can be obtained, and a fine injection molded article such as a face fastener part having a base portion and a regularly positioned plurality of projections having a leg generating from the base portion and a mushroom-shaped head linked to the end of the leg can be produced with high accuracy in a short time.
  • a heater infrared light, etc. can be used.
  • a melting temperature 160-260°C, 190-240°C is preferable. In the former range, a lower melt viscosity is obtained and a core material is not crosslinked by over heating. In the latter range, a more lower melt temperature is obtained, and a core material is neither crosslinked and nor discolored.
  • a molten core material is molded into a desired shape in a mold. Fine shaped articles can be easily produced in a short time. Note that to accelerate solidification of a core and to remove the core early and in a short time, a mold is preferably cooled to a predetermined temperature with, for example, cooled air.
  • water soluble core for injection molding which is excellent in thermoresistance, fluidity and water solubility.
  • a molten material for injection molding can be injection-molded.
  • a complicated and fine shaped article such as surface fastener part can be molded in a single step.
  • the injection is desirably carried out at a temperature lower than the melting temperature of the core.
  • Ax3OO Water soluble PVA/PEO copolymer resin, "ECOMATY” produced by Japan Synthetic Chemistry Ind. Co., Ltd.
  • Ax2OOO Water soluble PVA/PEO copolymer resin, "ECOMATY” produced by Japan Synthetic Chemistry Ind. Co., Ltd. AL03-2: Polyvinyl alcohol produced by Japan Synthetic Chemistry Ind. Co., Ltd.
  • GL05 Polyvinyl alcohol produced by Japan Synthetic Chemistry Ind. Co., Ltd.
  • KP08 Polyvinyl alcohol produced by Japan Synthetic Chemistry Ind. Co., Ltd.
  • KL05 Poly-vinyl alcohol produced by Japan Synthetic Chemistry Ind. Co., Ltd.
  • GBI330TE Water soluble acrylic resin produced by Berrant Co., Ltd.
  • PEOX200 Poly(ethyl oxazoline) produced by Dow Chemical Co., Ltd.
  • PEO-1 Poly(ethylene oxide) produced by Sumitomo Seika Co., Ltd.
  • GB731B Glass beads produced by Toshiba Barotini Co., Ltd.
  • Talc "Talc MS-A11 produced by Japan Talc Co., Ltd.
  • Examples 1 and 2 and Comparative Examples 1 to 3 A water soluble resin, "ECOMATY”, produced by Nihon Gosei Kagaku Kogyo K.K. (Japan Synthetic Chemistry Ind. Co., Ltd.) and a PVA were dried for 24 hours by use of a hot air dryer, whereafter a core was produced at a temperature of 210°C, by use of a core mold No. 6 produced by Sumitomo 3M Co., Ltd. by an injection molding machine of "PS-40" type produced by Nissei Jushi Kogyo K.K. [Nissei Resin Ind. Co., Ltd.].
  • the saponification degree was calculated from the integrated intensity ratio determined by use of a nuclear magnetic resonance device "EX 270", produced by Nihon Denshi K.K. [Japan Electronic Co., Ltd.]
  • the temperature of the core material was elevated from -60 to 300°C at a rate of 10°C/min by use of "DSC-2C" manufactured by Perkin Elmer Ind. Co., Ltd., and the Tm and T g values were determined from the change of specific heats.
  • the temperature of the core material was elevated at a rate of 10°C/min by use of an apparatus for thermogravimetry "951" manufactured by Dupon Co., Ltd., and the decomposition temperature in the air atmosphere was determined.
  • MI Melt Index
  • the melt index (MI) values of the core materials were determined, respectively, by use of a Melt Indexer S-1001 manufactured by Toyo Seiki Ind. Co., Ltd., according to ASTM D-1238 (at 210°C, under a loading of 2160g).
  • face fasteners were prepared under the under-described temperature conditions, respectively. Subsequently, a stem line was cut out from each face fastener in the longitudinal direction, and the heat resistances of the core materials were evaluated by microscopically judging the shape and uniformity of the stem group viewed from the direction of the cross section of the stem line, according to the following criterion.
  • MI melt indices

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)

Abstract

Matériau pour noyau destiné au moulage par injection, formé d'un copolymère obtenu à partir d'un alcool polyvinylique (PVA) et d'un oxyde de polyéthylène, et noyau composé dudit matériau.
EP95915552A 1994-04-05 1995-04-03 Materiau pour noyau moulage et procede de moulage par injection Withdrawn EP0754109A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP66918/94 1994-04-05
JP6066918A JPH07276372A (ja) 1994-04-05 1994-04-05 中子材料及びその使用
PCT/US1995/004194 WO1995026864A1 (fr) 1994-04-05 1995-04-03 Materiau pour noyau moulage et procede de moulage par injection

Publications (1)

Publication Number Publication Date
EP0754109A1 true EP0754109A1 (fr) 1997-01-22

Family

ID=13329845

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95915552A Withdrawn EP0754109A1 (fr) 1994-04-05 1995-04-03 Materiau pour noyau moulage et procede de moulage par injection

Country Status (6)

Country Link
EP (1) EP0754109A1 (fr)
JP (1) JPH07276372A (fr)
KR (1) KR970702136A (fr)
CN (1) CN1144502A (fr)
CA (1) CA2187180A1 (fr)
WO (1) WO1995026864A1 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6070107A (en) * 1997-04-02 2000-05-30 Stratasys, Inc. Water soluble rapid prototyping support and mold material
US6067480A (en) * 1997-04-02 2000-05-23 Stratasys, Inc. Method and apparatus for in-situ formation of three-dimensional solid objects by extrusion of polymeric materials
US6228923B1 (en) 1997-04-02 2001-05-08 Stratasys, Inc. Water soluble rapid prototyping support and mold material
JP4071846B2 (ja) * 1997-06-03 2008-04-02 大成プラス株式会社 プラスチック製成形体の製造方法
JP2001293742A (ja) * 2000-04-11 2001-10-23 Daisee Kogyo Kk 射出成形品の製造方法
ATE449796T1 (de) 2001-05-14 2009-12-15 Kuraray Co Modifiziertes ethylen-vinylalkohol-copolymer und herstellungsverfahren dafür
CN106496908A (zh) * 2016-10-07 2017-03-15 常州创索新材料科技有限公司 一种水溶性芯模材料的制备方法

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3639507A (en) * 1966-09-07 1972-02-01 Trw Inc Plastic pattern material for investment casting
DE69118622T2 (de) * 1990-09-04 1996-09-19 Nippon Synthetic Chem Ind Biologisch abbaubare, schmelzgeformte Gegenstände, Laminate daraus und ihre Verwendung
US5242646A (en) * 1992-05-07 1993-09-07 Minnesota Mining And Manufacturing Company Method of making an interengaging fastener member
JP3029347B2 (ja) * 1992-07-24 2000-04-04 理研ビニル工業株式会社 中子用組成物

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9526864A1 *

Also Published As

Publication number Publication date
MX9604403A (es) 1997-07-31
JPH07276372A (ja) 1995-10-24
WO1995026864A1 (fr) 1995-10-12
KR970702136A (ko) 1997-05-13
CA2187180A1 (fr) 1995-10-12
CN1144502A (zh) 1997-03-05

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