1. An injection compression-molding method for producing a molded article using an injection compression molding apparatus comprising two mold supporting plates facing each other, wherein at least one of the two mold supporting plates is movable toward and away from the other of the two mold supporting plates, and wherein each of the mold supporting plates supports a mold, a clamping mechanism for moving at least one of the two mold supporting plates toward and away from the other of the two mold supporting plates so as to set the molds to an intermediate clamped state for injection of melted resin into a cavity defined by the molds and set the molds to a final clamped state during or after the injection of the melted resin, and a plurality of parallelism retaining mechanisms arranged around the molds for retaining parallelism between the molds in the intermediate clamped state, wherein each parallelism retaining mechanism includes a positioning cylinder attached on the one mold supporting plate and extending toward the other mold supporting plate, the positioning cylinder having a rod expandable in a mold clamping direction, and a contact unit attached on the other mold supporting plate and extending toward the one mold supporting plate, further comprising a fine adjuster attached at a distal end portion of the contact unit and operative to move toward and away from the positioning cylinder in the mold clamping direction so as to come into an adjusted specified position with respect to the positioning cylinder, the method comprising a step of setting all of the parallelism retaining mechanisms at a specified distance by operating the distal end portion of the contact unit before starting the molding operation.
2. The method according to claim 1, wherein the melted resin contains an amorphous thermoplastic resin of 20 mass % or more.
3. The method according to claim 1, wherein each of the molds has a parting surface, the parting surfaces being in a substantially non-contact state with each other.
4. An injection compression-molding apparatus for producing a molded article, comprising:
two mold supporting plates facing each other, wherein at least one of the two mold supporting plates is movable toward and away from the other of the two mold supporting plates, and wherein each of the mold supporting plates supports a mold;
a clamping mechanism for moving at least one of the two mold supporting plates toward and away from the other of the two mold supporting plates so as to set the molds to an intermediate clamped state for injection of melted resin into a cavity defined by the molds and set the molds to a final clamped state during or after the injection of the melted resin; and
a plurality of parallelism retaining mechanisms arranged around the molds for retaining parallelism between the molds in the intermediate clamped state,
wherein each parallelism retaining mechanism includes a positioning cylinder attached on the one mold supporting plate and extending toward the other mold supporting plate, the positioning cylinder having a rod expandable in a mold clamping direction, and a contact unit attached on the other mold supporting plate and extending toward the one mold supporting plate, further comprising a fine adjuster attached at a distal end portion of the contact unit and operative to move toward and away from the positioning cylinder in the mold clamping direction so as to come into an adjusted specified position with respect to the positioning cylinder, whereby the distal end portion of the contact unit comes into contact with the rod of the corresponding positioning cylinder at a regulated position to retain the parallelism between the molds.
5. The apparatus according to claim 4, wherein the fine adjuster at the distal end portion of the contact unit is movable toward and away from the positioning cylinder by rotating the fine adjuster.
6. The apparatus according to claim 4, further comprising:
hydraulic pressure setting sections each of which corresponds to the positioning cylinder of each parallelism mechanism, each hydraulic pressuresetting section being operative to feed and discharge hydraulic fluid so as to expand and contract the rod of the positioning cylinder toward and away from the contact unit at a specified retaining pressure; and
a control system which is operative to set at least one of the retaining pressure and a hydraulic fluid discharging rate in each hydraulic pressure setting section individually so as to minimize an influence of load variation to the parallelism at the time of re-clamping in the intermediate clamped state.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A modified polyphenylene ether resin which is a reaction product of 100 parts by weight of (A) a polyphenylene ether having a main chain structure of the following formula (1):
(wherein R1 and R4 each independently represents hydrogen, a primary or secondary lower alkyl, a phenyl, an aminoalkyl or a hydrocarbonoxy, and R2 and R3 each independently represents hydrogen, a primary or secondary lower alkyl or a phenyl), and 0.01 to 10.0 parts by weight of (B) a modifier selected from dienophilic compounds having one dienophile group, wherein the number of rearrangement structures each represented by the following formula (2):
(wherein R1, R2, R3 and R4 have the same meanings as defined above in the formula (1)) is less than 0.01 per 100 phenylene ether units of the formula (1).
2. The modified polyphenylene ether resin according to claim 1, wherein the number of the rearrangement structures represented by the formula (2) is less than 0.005 per 100 phenylene ether units of the formula (1).
3. The modified polyphenylene ether resin according to claim 1, wherein the modifier (B) is maleic anhydride, maleic acid, fumaric acid, phenyl maleimide, itaconic acid, malic acid, glycidyl acrylate or glycidyl methacrylate.
4. The modified polyphenylene ether resin according to claim 1, which is obtained by reacting 0.2 to 3.0 parts by weight of the modifier (B) with 100 parts by weight of the polyphenylene ether (A).
5. The modified polyphenylene ether resin according to claim 1 wherein the reaction of polyphenylene ether (A) and modifier (B) is carried out in a state where the polyphenylene ether (A) is a solid.
6. The modified polyphenylene ether resin according to claim 1 or 2, which contains no foreign substance.
7. The modified polyphenylene ether resin according to claim 1, wherein the modifier is any one of the dienophilic compounds selected from the group consisting of maleic anhydride, fumaric acid, phenyl maleimide, maleic acid and glycidyl methacrylate.
8. The modified polyphenylene ether resin according to claim 7, wherein the modifier is any one of the dienophilic compounds selected from the group consisting of maleic anhydride, fumaric acid, phenyl maleimide and maleic acid.
9. A modified polyphenylene ether resin which is a reaction product of 100 parts by weight of (A) a polyphenylene ether having a main chain structure of the following formula (1):
and 0.01 to 10.0 parts by weight of (B) a modifier selected from the group consisting of dienophilic compounds having one dienophilic group and precursors of the dienophilic compounds, wherein the peak area of the 6.92 ppm of 1H-NMR is less than 0.01 per 100 phenylene ether units of the peak area of 6.43 ppm of 1H-NMR.