UV-curable film compositions with improved scratch resistance
AssigneeSabic Global Technologies B.V.
InventorsKwan Hongladarom, Jean-Francois Morizur, Paul Dean Sybert
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Abstract
Thin walled products having good scratch resistance are disclosed, as are processes for making such products (e.g. films, sheets, and thin walled articles). The product includes a thin layer formed from (A) a cross-linkable polycarbonate resin having endcaps derived from a monohydroxybenzophenone; and (B) if desired, a base polymeric resin. When exposed to ultraviolet light, crosslinking will occur in the layer with the cross-linkable polycarbonate resin, enhancing the scratch resistance properties of the thin layer and the overall product.
Claims18
A thin walled product comprising:
- a crosslinked layer formed from a photoactive additive that has been exposed to ultraviolet light, the photoactive additive containing photoactive endcap groups derived from monohydroxybenzophenone and endcap groups derived from a non-photoactive end-capping agent;
- wherein the photoactive additive is a homopolycarbonate formed from the reaction of:
- the monohydroxybenzophenone;
- a diol chain extender which is bisphenol A;
- a first linker moiety which is phosgene;
- and
- the non-photoactive end-capping agent;
- and
- wherein the photoactive additive has a monohydroxybenzophenone-derived endcap content from 3.0 to 5.0 mol %;
- and
- wherein the photoactive additive does not contain any aliphatic polyester, aliphatic polyether, aliphatic polythioether, aliphatic polyacetal, aliphatic polycarbonate, C-C linked polymer, and polysiloxane segments.
A thin walled product comprising:
- a crosslinked layer formed from a photoactive additive that has been exposed to ultraviolet light, the photoactive additive containing photoactive endcap groups derived from monohydroxybenzophenone;
- and
- wherein the photoactive additive has a monohydroxybenzophenone-derived endcap content from 3.0 to 5.0 mol %;
- and
- the photoactive additive has a structure of Formula (II):
- wherein n′ ranges from 29 to 65, and
- wherein the thin walled product further comprises a substrate layer formed from a substrate resin and bonded to the crosslinked layer, and the thin walled product has a scratch rating of B or harder according to ASTM D3363.
Dependencies are inferred from the claim text.