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

Claim 0:
1. A sheetlike composite comprising, as layers of a layer sequence in the direction from an outer face of the sheetlike composite to an inner face of the sheetlike composite,
a) first colour application, which is a chromatic ink application,
b) a first polymer layer, which is a white primer layer,
c) a further polymer layer, which is a polyolefin layer,
d) a carrier layer, and
e) a barrier layer,
wherein the first polymer layer is characterized by a ratio of a proportion of aromatic groups in the first polymer layer to a proportion of carbonyl groups in the first polymer layer in a range from 0.18 to 0.34,
wherein the ratio of the proportion of aromatic groups in the first polymer layer to the proportion of carbonyl groups in the first polymer layer 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 1720 to 1740 cm−1,

wherein the first polymer layer is further characterized by a ratio of a proportion of aliphatic groups in the first polymer layer to the proportion of carbonyl groups in the first polymer layer in a range from 0.40 to 0.60,
wherein the ratio of the proportion of aliphatic groups in the first polymer layer to the proportion of carbonyl groups in the first polymer layer 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 2900 to 2950 cm−1 to the area of a maximum of the ATR spectrum in the wave number range from 1720 to 1740 cm−1.