SEOUL, May 19 (Reuters) - Samsung Electronics ( SSNLF )

and its South Korean labour union began another

round of talks on Tuesday to break an impasse in bonus

negotiations, after dialogue on Monday did not produce an

agreement.

The two sides are under mounting pressure to avert an

imminent strike that threatens to hurt the Korean economy and

chip production, but remained far apart during the

government-mediated pay talks on Monday.

South Korea's Prime Minister threatened over the weekend to

step in through emergency arbitration to stop a strike that is

scheduled to start on Thursday and last for 18 days.

Media reports said on Tuesday, citing the chairman of the

National Labor Relations Commission that Samsung and the labour

union are narrowing some differences.

A court on Monday partially granted Samsung's request for an

injunction, ruling that essential staffing levels at some

production facilities must be maintained during industrial

action.

The ongoing dispute is the biggest clash between Samsung and

its labour union since Samsung Electronics ( SSNLF ) ​Chairman Jay Y. Lee

pledged to shed its reputation of union-busting activities in

2020, months after the creation of its first labour union.

Samsung is one of the most sought-after workplaces in Korea,

but employees were increasingly frustrated with a widening pay

gap with smaller rival SK Hynix, which took an early

lead in supplying high-bandwidth memory for artificial

intelligence chip units to Nvidia ( NVDA )

SK Hynix introduced overhauls in pay structure last year,

resulting in bonuses which are more than three times higher than

those offered to Samsung workers, accelerating talent defections

to SK Hynix and sparking a surge in Samsung union membership,

union members said.

Exacerbating workers' ire have been Samsung's record profits

as the AI boom drives up demand for chips.

Samsung has proposed that memory chip workers receive

bonuses that would top those of SK Hynix employees.

The union has demanded Samsung abolish a bonus cap of 50% on

annual salaries, allocate 15% of annual operating profit to a

bonus pool shared by workers and formalise this in contracts.

Samsung proposed assigning 9%-10% of its annual operating

profit to a bonus should the profit exceed 200 trillion won this

year, while sticking to the 50% bonus pay cap, the union said.

Jay Y. Lee apologised to customers and the public over the

labour dispute ​in his first public comments on the issue.

Samsung's customers include Alphabet, Apple ( AAPL ),

Amazon ( AMZN ) and Nvidia ( NVDA ).

(Reporting by Hyunjoo Jin; Editing by Muralikumar Anantharaman)