Invention Grant
- Patent Title: Coating structure, sheet-like product and its use
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Application No.: US16617770Application Date: 2018-06-14
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Publication No.: US11242654B2Publication Date: 2022-02-08
- Inventor: Tarja Turkki , Anneli Lepo
- Applicant: Kemira Oyj
- Applicant Address: FI Helsinki
- Assignee: Kemira Oyj
- Current Assignee: Kemira Oyj
- Current Assignee Address: FI Helsinki
- Agency: Meunier Carlin & Curfman LLC
- Priority: FI20175560 20170615
- International Application: PCT/FI2018/050464 WO 20180614
- International Announcement: WO2018/229344 WO 20181220
- Main IPC: D21H19/82
- IPC: D21H19/82 ; B65D65/42 ; D21H19/20 ; D21H19/40 ; D21H19/54 ; D21H19/58 ; D21H19/64 ; D21H27/10

Abstract:
A coating structure for a sheet-like substrate, which includes lignocellulosic fibres is disclosed. The structure includes at least one pre-coat layer including at least 70 weight-% of a first styrene (meth)acrylate copolymer polymerised in the presence of a stabiliser, having a glass transition temperature Tg ≤20° C. preferably ≤10° C., ≤30 weight-% of inorganic platy mineral particles and 0.01-2 weight-% of at least one first thickener. The coating structure further includes a top coat layer including at least 50 weight-% of a second styrene (meth)acrylate copolymer polymerised in the presence of a stabiliser having a glass transition temperature Tg ≤20° C. preferably ≤10° C., ≤30 weight-% of inorganic mineral particles, 0.01-5 weight-% of at least one second thickener and 0.5-30 weight-% of an antiblocking agent. Further disclosed is a sheet-like product coated with the coating structure.
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