Photocurable compositions
US8097399B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 21, 2005 |
| Grant date | Jan 17, 2012 |
| Priority date | — |
| Expiry date | Nov 14, 2027 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29K2033/00
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
An optical moulding process is disclosed comprising the sequential steps of: (a)(y) forming a layer of a photocurable composition; and (bXz) irradiating selected areas of the composition in the layer with radiation from a radiation source, thereby curing the composition in said selected areas and repeating the steps a) and b) on top of an earlier cured layer to form a three dimensional structure, wherein the radiation source used in step b) is a non-coherent source of radiation and wherein the photocurable composition comprises at least two curable components: (i) 45%-95% (and preferably at least 50%, more preferably at least 60%, e.g. at least 70%) by weight of the total curable components in the composition is a first component that is photocurable and that is such that, when cured in the presence of a photocuring initiator by exposure to UV radiation having an energy of 30 mJ/cm2, at least 90% of the component is cured within 50 milliseconds; and (ii) 5% to 55% (and preferably 10-40%, more preferably 15 to 30%, e.g. about 20%) by weight of the total curable components in the composition is a second component that results in the composition, on curing, shrinking, in a linear dire…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.