Method of manufacture, by means of thermoplastic moulding, of elements made of crystallizable plastic material with a strengthening load
US4127554A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 19, 1976 |
| Grant date | Nov 28, 1978 |
| Priority date | — |
| Expiry date | Jul 19, 1996 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J3/2053
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A method for manufacturing molded thermoplastic products formed of crystallizable plastic material containing reinforcing elements. The reinforcing elements are added to the molten thermoplastic material and are capable of being moved by the front of recrystallization during growth of the crystallites in the thermoplastic material so that the reinforcing elements are disposed in the interspherulitic zones between crystallites when the crystals have been fully grown. The reinforcing elements are selected so that they have dimensions smaller than the dimensions of the crystallites of thermoplastic material, they are present in an amount of 0.05 to 5% by weight based on the thermoplastic material and they have a shape favorable to the transfer of mechanical stresses and, in addition, the boundary of the reinforcing element particles is sufficiently defined so that the particles can be moved by the growing front of recrystallization of the spherulites. The reinforcing elements may be insoluble in the molten semi-plastic material. The reinforcing particles may be preferentially crystallized from the molten thermoplastic material if soluble or partially soluble therein or, may be grown o…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.