Abstract:
A method for forming hollow or tubular objects from thermoplastic or thermosetting polymer compositions employing a stamping or rapid forming operation. The plastic objects may optionally be reinforced and/or particulate filled and are formed by stamping around an internal shape using matched external mating mold sections.
Abstract:
Long glass fiber reinforcement allows the use of extremely low molecular weight polymer in a composite which is formable in a mold held at ambient temperatures by preheating the composite sheet outside of the mold. The glass-reinforced, low molecular weight polyamide, per se, may be formed in a conventional metal stamping mold and exhibits excellent performance and good surface properties.
Abstract:
Thermoplastic shell-like objects are joined or repaired by supporting the area of the object to be treated, applying a preheated, reinforced thermoplastic charge and exerting pressure against the support to seal the desired area.
Abstract:
1373439 Laminates ALLIED CHEMICAL CORP 22 Sept 1972 [22 Sept 1971] 43960/72 Heading B5N [Also in Division C3] Laminates are prepared by (a) distributing powdered novaculite (a form of quartz), filled polyethylene terephthalate between seven layers of non-woven glass mats and fusing the assembly, (b) introducing a glass mat or loose glass fibre between two layers of novaculite filled polyester and passing the assembly through rollers, or (c) placing a sheet formed from polyester and novaculite between a number of alternating polyester sheet glass fibre layers and fusing the assembly. Graphite fibres may be used in place of the glass fibres.
Abstract:
The fibre-reinforced thermoplastic sheets consist of an amide polymer, or copolymer contg. >=30% amide, with ave. mol. wt. of 3,000-25,000, in which 10-75% glass fibre of length 3.75 cm. min., are embedded. The polymer is pref. nylon-6 or nylon-6,6, or copolymers contg. >=50% of these. The compsns. may also contain 1-50% of sheet fibre or non-fibrous fillers. The sheets are suitable, when heated to a temp. between their softening pt. and 280 degrees C, for shaping in moulds at ambient temp., is not >10 degrees C above the Tg of the polymer. Owing to the low viscosity and surface tension, and good wetting props. of the polymer, combined with use of long fibres, prodts. of high impact and bend strength, and increased heat deformation temps. are obtained.
Abstract:
1403205 Novaculite filled polyesters ALLIED CHEMICAL CORP 27 Nov 1972 [26 Nov 1971] 54699/72 Heading C3R A reinforced synthetic resinous composition comprises (a) 20 to 95% by weight of at least one linear semicrystalline polyester having a weight average molecular weight of 15,000 to 90,000; (b) 5 to 80% by weight of novaculite having a maximum particle size of about 40 microns and optionally (c) 5 to 50% by weight of glass fibres. The term "polyester" covers both polyesters and copolyesters containing less than 30% of a modifying constituent, e.g. a second acid, a second diol or both. Polyethylene terephthalate is nevertheless the preferred polyester. The semicrystalline polyesters normally have an intrinsic viscosity at 30‹ C. of 0À28 to 0À97 as measured in 1À1 tetrachlorethane/phenol.
Abstract:
The addition to filled thermoplastic resin systems of small amounts of fibrous material, of aspect ratio at least about 10 times the aspect ration of the filler, facilitates dispersion and processing of these filled compositions into shaped articles and gives a product exhibiting superior surface properties.
Abstract:
Processability of highly filled thermoplastic compsns. formable under heat and pressure and contg. 25-50 wt. % filler (I) is improved by combining the polymer, filler and a dispersion material (II) comprising 0.5-15% fibrous material having an aspect ratio >=10 times that of filler, the (I) being of sufficient length before blending such that its length after blending is 1/8 inch; and intimately blending mixt. Addn. of (II) markedly facilitates dispersion of (I) in compsns., removes difficulties associated with additional melt processing, facilitates handling and feeding of the 'dry blend' in hoppers, conveyors, etc., prevents bridging in hopper and cuases less strain on conventional mixing/extruding equipment. The process enables prodn. of superior quality reinforced filled thermoplastic compsns.
Abstract:
Processability of highly filled thermoplastic compsns. formable under heat and pressure and contg. 25-50 wt. % filler (I) is improved by combining the polymer, filler and a dispersion material (II) comprising 0.5-15% fibrous material having an aspect ratio >=10 times that of filler, the (I) being of sufficient length before blending such that its length after blending is 1/8 inch; and intimately blending mixt. Addn. of (II) markedly facilitates dispersion of (I) in compsns., removes difficulties associated with additional melt processing, facilitates handling and feeding of the 'dry blend' in hoppers, conveyors, etc., prevents bridging in hopper and cuases less strain on conventional mixing/extruding equipment. The process enables prodn. of superior quality reinforced filled thermoplastic compsns.
Abstract:
1373439 Laminates ALLIED CHEMICAL CORP 22 Sept 1972 [22 Sept 1971] 43960/72 Heading B5N [Also in Division C3] Laminates are prepared by (a) distributing powdered novaculite (a form of quartz), filled polyethylene terephthalate between seven layers of non-woven glass mats and fusing the assembly, (b) introducing a glass mat or loose glass fibre between two layers of novaculite filled polyester and passing the assembly through rollers, or (c) placing a sheet formed from polyester and novaculite between a number of alternating polyester sheet glass fibre layers and fusing the assembly. Graphite fibres may be used in place of the glass fibres.