Patent ID: 11878848
Assignee: SIG TECHNOLOGY AG
Field: Surface technology, coating (Chemistry)
Classification: CPC B | IPC B

Claim 4:
5. A process for producing the sheetlike composite according to claim 1, the process comprising, as process steps,
a) providing a sheetlike composite precursor comprising, as mutually superposing layers of a layer sequence,
i) the further polymer layer,
ii) the carrier layer, and
iii) the barrier layer;

b) overlaying the carrier layer with a liquid first polymer layer precursor composition on a side facing away from the barrier layer and obtaining the first polymer layer from the liquid first polymer layer precursor composition,
c) overlaying the carrier layer with a liquid first colour application precursor composition on a side facing away from the barrier layer and obtaining the first colour application from the liquid first colour application precursor composition, wherein the liquid first polymer layer precursor composition is characterized by a ratio
of a proportion of aromatic groups in the liquid first polymer layer precursor composition to a proportion of aliphatic groups in the liquid first polymer layer precursor composition in a range from 0.30 to 0.80,
wherein the ratio of the proportion of aromatic groups in the liquid first polymer layer precursor composition to the proportion of aliphatic groups in the liquid first polymer layer precursor composition is determined by
measuring an ATR spectrum that covers a wave number range from 3500 to 1400 cm−1 with a resolution of 4 cm−1 is recorded at 45° by means of a diamond as detector tip, and
calculating the ratio of the area of a maximum of the ATR spectrum in the wave number range from 1590 to 1610 cm−1 to the area of a maximum of the ATR spectrum in the wave number range from 2900 to 2950 cm−1.